cmos checksum error

  • Thread starter Thread starter Amanda
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Amanda

Guest
Hello,



Each time I boot my computer, it shows cmos checksum error. Press F8 for

system configuration but the F8 doesn't work, F9 doesn't work either. F1

allows it to boot and the system gets set at 1st Jan 2007 12.00 am.



Regardless of how many times I change the bios, it will revert after each

power down. I don't have a floppy but it seems to insist i do, strange thing

is .. a floppy disk drive and floppy controller exist on my device manager.

If I remove it, the computer detects the zoombie floppy and reinstalls it.



I've also replaced the button battery but that didn't help.



Could anyone help?



Thanks in advance.

Sonny



P.S I had to reset the time before posting because it says this post is too

old
 
How did you change the BIOS? Did you rewrite it?

"Amanda" wrote in message

news:urQUFQ7CLHA.5808@TK2MSFTNGP02.phx.gbl...

> Hello,

>

> Each time I boot my computer, it shows cmos checksum error. Press F8 for

> system configuration but the F8 doesn't work, F9 doesn't work either. F1

> allows it to boot and the system gets set at 1st Jan 2007 12.00 am.

>

> Regardless of how many times I change the bios, it will revert after each

> power down. I don't have a floppy but it seems to insist i do, strange

> thing

> is .. a floppy disk drive and floppy controller exist on my device

> manager.

> If I remove it, the computer detects the zoombie floppy and reinstalls it.

>

> I've also replaced the button battery but that didn't help.

>

> Could anyone help?

>

> Thanks in advance.

> Sonny

>

> P.S I had to reset the time before posting because it says this post is

> too old

>
 
You have a hardware problem. Are you sure the button battery was good?

Are you killing power to the PC externally, like with a power strip? If

so, don't.



Amanda wrote:



> Hello,

>

> Each time I boot my computer, it shows cmos checksum error. Press F8 for

> system configuration but the F8 doesn't work, F9 doesn't work either. F1

> allows it to boot and the system gets set at 1st Jan 2007 12.00 am.

>

> Regardless of how many times I change the bios, it will revert after each

> power down. I don't have a floppy but it seems to insist i do, strange thing

> is .. a floppy disk drive and floppy controller exist on my device manager.

> If I remove it, the computer detects the zoombie floppy and reinstalls it.

>

> I've also replaced the button battery but that didn't help.

>

> Could anyone help?

>

> Thanks in advance.

> Sonny

>

> P.S I had to reset the time before posting because it says this post is too

> old

>

>
 
"Amanda" wrote in message news:urQUFQ7CLHA.5808@TK2MSFTNGP02.phx.gbl...

> Hello,

> Each time I boot my computer, it shows cmos checksum error. Press F8 for

> system configuration but the F8 doesn't work, F9 doesn't work either. F1

> allows it to boot and the system gets set at 1st Jan 2007 12.00 am.






Try tapping the F8 key repeatedly or hitting it before the error message is

displayed. Be sure to save any changes you make. If this doesn't help, try

a different keyboard.



Ben
 
Hi,



Thanks to all who replied. I reset the BIOS hitting delete, change the first

boot sequence to hard disk, disable the search for floppy. Change the time

yet again.



Bob L, I bought a brand new battery and its the same thing.



regards

Sonny







"Ben Myers" wrote in message

news:e7xeOJ%23CLHA.420@TK2MSFTNGP02.phx.gbl...

"Amanda" wrote in message

news:urQUFQ7CLHA.5808@TK2MSFTNGP02.phx.gbl...

> Hello,

> Each time I boot my computer, it shows cmos checksum error. Press F8 for

> system configuration but the F8 doesn't work, F9 doesn't work either. F1

> allows it to boot and the system gets set at 1st Jan 2007 12.00 am.






Try tapping the F8 key repeatedly or hitting it before the error message is

displayed. Be sure to save any changes you make. If this doesn't help, try

a different keyboard.



Ben
 
Ben,



I've just rebooted and tried hitting the F8 button, doesn't work, comes up

to the same screen with the f8 f9 f1 and delete option.



regards,

Sonny





"Ben Myers" wrote in message

news:e7xeOJ%23CLHA.420@TK2MSFTNGP02.phx.gbl...

"Amanda" wrote in message

news:urQUFQ7CLHA.5808@TK2MSFTNGP02.phx.gbl...

> Hello,

> Each time I boot my computer, it shows cmos checksum error. Press F8 for

> system configuration but the F8 doesn't work, F9 doesn't work either. F1

> allows it to boot and the system gets set at 1st Jan 2007 12.00 am.






Try tapping the F8 key repeatedly or hitting it before the error message is

displayed. Be sure to save any changes you make. If this doesn't help, try

a different keyboard.



Ben
 
Bob,



Nope it didn't work. Its the same even if i do a Start-Turn off

Computer-Restart.



Sonny



"Bob I" wrote in message

news:OlxZzV9CLHA.5464@TK2MSFTNGP05.phx.gbl...

> You have a hardware problem. Are you sure the button battery was good? Are

> you killing power to the PC externally, like with a power strip? If so,

> don't.

>

> Amanda wrote:

>

>> Hello,

>>

>> Each time I boot my computer, it shows cmos checksum error. Press F8 for

>> system configuration but the F8 doesn't work, F9 doesn't work either. F1

>> allows it to boot and the system gets set at 1st Jan 2007 12.00 am.

>>

>> Regardless of how many times I change the bios, it will revert after each

>> power down. I don't have a floppy but it seems to insist i do, strange

>> thing

>> is .. a floppy disk drive and floppy controller exist on my device

>> manager.

>> If I remove it, the computer detects the zoombie floppy and reinstalls

>> it.

>>

>> I've also replaced the button battery but that didn't help.

>>

>> Could anyone help?

>>

>> Thanks in advance.

>> Sonny

>>

>> P.S I had to reset the time before posting because it says this post is

>> too old


>
 
If it won't hold the BIOS settings through a simple Restart, (never

actually removes power from the motherboard)then it certainly is a

hardware issue with the motherboard.



Amanda wrote:



> Bob,

>

> Nope it didn't work. Its the same even if i do a Start-Turn off

> Computer-Restart.

>

> Sonny

>

> "Bob I" wrote in message

> news:OlxZzV9CLHA.5464@TK2MSFTNGP05.phx.gbl...

>

>>You have a hardware problem. Are you sure the button battery was good? Are

>>you killing power to the PC externally, like with a power strip? If so,

>>don't.

>>

>>Amanda wrote:

>>

>>

>>>Hello,

>>>

>>>Each time I boot my computer, it shows cmos checksum error. Press F8 for

>>>system configuration but the F8 doesn't work, F9 doesn't work either. F1

>>>allows it to boot and the system gets set at 1st Jan 2007 12.00 am.

>>>

>>>Regardless of how many times I change the bios, it will revert after each

>>>power down. I don't have a floppy but it seems to insist i do, strange

>>>thing

>>>is .. a floppy disk drive and floppy controller exist on my device

>>>manager.

>>>If I remove it, the computer detects the zoombie floppy and reinstalls

>>>it.

>>>

>>>I've also replaced the button battery but that didn't help.

>>>

>>>Could anyone help?

>>>

>>>Thanks in advance.

>>>Sonny

>>>

>>>P.S I had to reset the time before posting because it says this post is

>>>too old


>>


>

>
 
On Tue, 15 Jun 2010 07:00:15 +0800, "Amanda"

wrote:



>

>Bob,

>

>Nope it didn't work. Its the same even if i do a Start-Turn off

>Computer-Restart.

>

>Sonny

>

>"Bob I" wrote in message

>news:OlxZzV9CLHA.5464@TK2MSFTNGP05.phx.gbl...

>> You have a hardware problem. Are you sure the button battery was good? Are

>> you killing power to the PC externally, like with a power strip? If so,

>> don't.

>>

>> Amanda wrote:

>>

>>> Hello,

>>>

>>> Each time I boot my computer, it shows cmos checksum error. Press F8 for

>>> system configuration but the F8 doesn't work, F9 doesn't work either. F1

>>> allows it to boot and the system gets set at 1st Jan 2007 12.00 am.

>>>

>>> Regardless of how many times I change the bios, it will revert after each

>>> power down. I don't have a floppy but it seems to insist i do, strange

>>> thing

>>> is .. a floppy disk drive and floppy controller exist on my device

>>> manager.

>>> If I remove it, the computer detects the zoombie floppy and reinstalls

>>> it.

>>>

>>> I've also replaced the button battery but that didn't help.

>>>

>>> Could anyone help?

>>>

>>> Thanks in advance.

>>> Sonny

>>>

>>> P.S I had to reset the time before posting because it says this post is

>>> too old


>>


>




Have you done a virus scan ?
 
You need to rewrite the BIOS. Contact the computer manufacturer and get the

correct method to rewrite the BIOS.

I use the floppy to update or rewrite the BIOS.

"Amanda" wrote in message

news:%23aXpUlHDLHA.4400@TK2MSFTNGP05.phx.gbl...

> Ben,

>

> I've just rebooted and tried hitting the F8 button, doesn't work, comes up

> to the same screen with the f8 f9 f1 and delete option.

>

> regards,

> Sonny

>

>

> "Ben Myers" wrote in message

> news:e7xeOJ%23CLHA.420@TK2MSFTNGP02.phx.gbl...

> "Amanda" wrote in message

> news:urQUFQ7CLHA.5808@TK2MSFTNGP02.phx.gbl...

>> Hello,

>> Each time I boot my computer, it shows cmos checksum error. Press F8 for

>> system configuration but the F8 doesn't work, F9 doesn't work either. F1

>> allows it to boot and the system gets set at 1st Jan 2007 12.00 am.


>

>

> Try tapping the F8 key repeatedly or hitting it before the error message

> is

> displayed. Be sure to save any changes you make. If this doesn't help,

> try

> a different keyboard.

>

> Ben

>

>

>
 
"Amanda" wrote in message news:#aXpUlHDLHA.4400@TK2MSFTNGP05.phx.gbl...

> Ben,

> I've just rebooted and tried hitting the F8 button, doesn't work, comes up

> to the same screen with the f8 f9 f1 and delete option.




If you are saying that pressing the F8 key does nothing when the message

is displayed, try a different keyboard. If you are getting into the BIOS setup,

make sure you are saving the changes, since this typically is not done automatically.



Ben
 
After you replace the CMOS battery, you often need to reset the CMOS. Usually

you do this by taking the battery out, installing it backwards in its holder

for 20 or 30 minutes to bleed off all the current. Then just take the battery

out, turn it around and install it properly.



Some mother boards have shorting terminals near the battery that let you

bleed off the current without removing the battery, check your users guide

for instructions on how to use those.



Either way you do it, when you restart your computer, the OS will reload the

CMOS with clean settings that may solve your problem.



Linusverl





"Ben Myers" wrote:



> "Amanda" wrote in message news:#aXpUlHDLHA.4400@TK2MSFTNGP05.phx.gbl...

> > Ben,

> > I've just rebooted and tried hitting the F8 button, doesn't work, comes up

> > to the same screen with the f8 f9 f1 and delete option.


>

> If you are saying that pressing the F8 key does nothing when the message

> is displayed, try a different keyboard. If you are getting into the BIOS setup,

> make sure you are saving the changes, since this typically is not done automatically.

>

> Ben

> .

>
 
Thanks to all who replied.



Ben - Just bought a new keyboard and tried, nope f8 & f9 still doesn't work.

Only working options are f1 and delete. Yes, i did save after changing the

bios setup. Doesn't work.



Jim - Yes I have anti virus installed and schedule to update and run

everyday. But the time set back because of the checksum error has made it

run at rather untimely. I do check the history once in a while to make

sure.



Linus - "After you replace the CMOS battery, you often need to reset the

CMOS. Usually you do this by taking the battery out, installing it backwards

in its holder" I don't quite understand this, do I take reset after I take

out the battery or after I replaced the battery? I hope you mean to take out

the old battery, drain off with the old battery and then replace with new.

Is that it? I'll try that.



I seem to think that the motherboard is dying. Either I get a new one or I

just punch F1 each time I turn on the computer and ignore the time.



Regards

Sonny





"Linus" wrote in message

news:DFD0CEE0-DB19-4503-B0D7-DFC103B71494@microsoft.com...

> After you replace the CMOS battery, you often need to reset the CMOS.

> Usually

> you do this by taking the battery out, installing it backwards in its

> holder

> for 20 or 30 minutes to bleed off all the current. Then just take the

> battery

> out, turn it around and install it properly.

>

> Some mother boards have shorting terminals near the battery that let you

> bleed off the current without removing the battery, check your users guide

> for instructions on how to use those.

>

> Either way you do it, when you restart your computer, the OS will reload

> the

> CMOS with clean settings that may solve your problem.

>

> Linusverl

>

>

> "Ben Myers" wrote:

>

>> "Amanda" wrote in message

>> news:#aXpUlHDLHA.4400@TK2MSFTNGP05.phx.gbl...

>> > Ben,

>> > I've just rebooted and tried hitting the F8 button, doesn't work, comes

>> > up

>> > to the same screen with the f8 f9 f1 and delete option.


>>

>> If you are saying that pressing the F8 key does nothing when the message

>> is displayed, try a different keyboard. If you are getting into the BIOS

>> setup,

>> make sure you are saving the changes, since this typically is not done

>> automatically.

>>

>> Ben

>> .

>>
 
On Jun 18, 4:00 pm, "Amanda" wrote:

> Thanks to all who replied.

>

> Ben - Just bought a new keyboard and tried, nope f8 & f9 still doesn't work.

> Only working options are f1 and delete. Yes, i did save after changing the

> bios setup. Doesn't work.

>

> Jim - Yes I have anti virus installed and schedule to update and run

> everyday. But the time set back because of the checksum error has made it

> run at rather untimely.  I do check the history once in a while to make

> sure.

>

> Linus - "After you replace the CMOS battery, you often need to reset the

> CMOS. Usually you do this by taking the battery out, installing it backwards

> in its holder" I don't quite understand this, do I take reset after I take

> out the battery or after I replaced the battery? I hope you mean to take out

> the old battery, drain off with the old battery and then replace with new..

> Is that it? I'll try that.

>

> I seem to think that the motherboard is dying. Either I get a new one or I

> just punch F1 each time I turn on the computer and ignore the time.

>

> Regards

> Sonny

>

> "Linus" wrote in message

>

> news:DFD0CEE0-DB19-4503-B0D7-DFC103B71494@microsoft.com...

>

>

>

> > After you replace the CMOS battery, you often need to reset the CMOS.

> > Usually

> > you do this by taking the battery out, installing it backwards in its

> > holder

> > for 20 or 30 minutes to bleed off all the current. Then just take the

> > battery

> > out, turn it around and install it properly.


>

> > Some mother boards have shorting terminals near the battery that let you

> > bleed off the current without removing the battery, check your users guide

> > for instructions on how to use those.


>

> > Either way you do it, when you restart your computer, the OS will reload

> > the

> > CMOS with clean settings that may solve your problem.


>

> > Linusverl


>

> > "Ben Myers" wrote:


>

> >> "Amanda" wrote in message

> >>news:#aXpUlHDLHA.4400@TK2MSFTNGP05.phx.gbl...

> >> > Ben,

> >> > I've just rebooted and tried hitting the F8 button, doesn't work, comes

> >> > up

> >> > to the same screen with the f8 f9 f1 and delete option.


>

> >> If you are saying that pressing the F8 key does nothing when the message

> >> is displayed, try a different keyboard.  If you are getting into theBIOS

> >> setup,

> >> make sure you are saving the changes, since this typically is not done

> >> automatically.


>

> >> Ben

> >> .




I don't see where you have identified your system well enough (the

right questions have not been asked).



You can try things all day long - how it that working out?



If your system boots, do this and we can identify the motherboard and

then you might get some better ideas:



Please provide additional information about your system:



Click Start, Run and in the box enter:



msinfo32



Click OK, and when the System Summary info appears, click Edit, Select

All, Copy and then paste the information back here.



There will be some personal information (like System Name and User

Name), and whatever appears to be private information to you, just

delete it from the pasted information.



This will minimize back and forth Q&A and eliminate guesswork. (too

late for the guesswork part).
 
On Jun 16, 6:20 am, Linus wrote:

> After you replace the CMOS battery, you often need to reset the CMOS. Usually

> you do this by taking the battery out, installing it backwards in its holder

> for 20 or 30 minutes to bleed off all the current. Then just take the battery

> out, turn it around and install it properly.

>

> Some mother boards have shorting terminals near the battery that let you

> bleed off the current without removing the battery, check your users guide

> for instructions on how to use those.

>

> Either way you do it, when you restart your computer, the OS will reload the

> CMOS with clean settings that may solve your problem.

>

> Linusverl

>

>

>

> "Ben Myers" wrote:

> > "Amanda" wrote in messagenews:#aXpUlHDLHA.4400@TK2MSFTNGP05.phx.gbl...

> > > Ben,

> > > I've just rebooted and tried hitting the F8 button, doesn't work, comes up

> > > to the same screen with the f8 f9 f1 and delete option.


>

> > If you are saying that pressing the F8 key does nothing when the message

> > is displayed, try a different keyboard.  If you are getting into the BIOS setup,

> > make sure you are saving the changes, since this typically is not done automatically.


>

> > Ben

> > .




Where can I read about this method of resetting the CMOS by inserting

the battery backwards for 20 to 30 minutes to bleed off the current?
 
You can't read about putting the battery in backwards because it doesn't

exist. That is

about the dumbest thing you can do on anything with a battery.

"Jose" wrote in message

news:099ac1fa-70b5-4002-9f8a-ef94337afe0f@z10g2000yqb.googlegroups.com...

On Jun 16, 6:20 am, Linus wrote:

> After you replace the CMOS battery, you often need to reset the CMOS.

> Usually

> you do this by taking the battery out, installing it backwards in its

> holder

> for 20 or 30 minutes to bleed off all the current. Then just take the

> battery

> out, turn it around and install it properly.

>

> Some mother boards have shorting terminals near the battery that let you

> bleed off the current without removing the battery, check your users guide

> for instructions on how to use those.

>

> Either way you do it, when you restart your computer, the OS will reload

> the

> CMOS with clean settings that may solve your problem.

>

> Linusverl

>

>

>

> "Ben Myers" wrote:

> > "Amanda" wrote in

> > messagenews:#aXpUlHDLHA.4400@TK2MSFTNGP05.phx.gbl...

> > > Ben,

> > > I've just rebooted and tried hitting the F8 button, doesn't work,

> > > comes up

> > > to the same screen with the f8 f9 f1 and delete option.


>

> > If you are saying that pressing the F8 key does nothing when the message

> > is displayed, try a different keyboard. If you are getting into the BIOS

> > setup,

> > make sure you are saving the changes, since this typically is not done

> > automatically.


>

> > Ben

> > .




Where can I read about this method of resetting the CMOS by inserting

the battery backwards for 20 to 30 minutes to bleed off the current?
 
> > "Jose" wrote in message

> >

> > Where can I read about this method of resetting the CMOS by inserting

> > the battery backwards for 20 to 30 minutes to bleed off the current?


>

> Unknown wrote:

> You can't read about putting the battery in backwards because it doesn't

> exist. That is about the dumbest thing you can do on anything with a battery.




There is a diode in that path, that also functions as

reverse polarity protection. Go to page 18 of this document, and

look at diode D3 in the bottom left hand corner of page 18. if

the battery were reversed, the D3 diode would be reverse biased,

and the current could not flow.



http://www.intel.com/design/chipsets/designex/BXDPDG10.htm



Also, as a result of that diode, plopping the battery in

backwards, isn't that effective. The provided CMOS jumper,

applied to the three pin header shown in that schematic, is

effective at doing its job. It won't take long to

drain the CMOS well. It's a bit harder, on the motherboards

that provide solder pads and no header pins, to consistently

hold the connection long enough, to complete

the draining. But if you have a header to work with,

that is just as good at sitting in a holding pattern, as

jamming the battery in backwards.



Paul
 
"Jose" wrote in message

news:099ac1fa-70b5-4002-9f8a-ef94337afe0f@z10g2000yqb.googlegroups.com...

On Jun 16, 6:20 am, Linus wrote:



Where can I read about this method of resetting the CMOS by inserting

the battery backwards for 20 to 30 minutes to bleed off the current?



I'm not sure about that either, you'll have to check with Linus, just a few

threads up.
 
Jose,



Here's what you requested.



OS Name Microsoft Windows XP Home Edition

Version 5.1.2600 Service Pack 2 Build 2600

OS Manufacturer Microsoft Corporation

System Name PAPA

System Manufacturer Biostar

System Model 945GC Micro 775

System Type X86-based PC

Processor x86 Family 6 Model 15 Stepping 13 GenuineIntel ~1996 Mhz

Processor x86 Family 6 Model 15 Stepping 13 GenuineIntel ~1996 Mhz

BIOS Version/Date Phoenix Technologies, LTD 6.00 PG, 5/23/2007

SMBIOS Version 2.4

Windows Directory C:\WINDOWS

System Directory C:\WINDOWS\system32

Boot Device \Device\HarddiskVolume1

Locale United States

Hardware Abstraction Layer Version = "5.1.2600.2180

(xpsp_sp2_rtm.040803-2158)"

User Name PAPA\papa

Time Zone Malay Peninsula Standard Time

Total Physical Memory 1,024.00 MB

Available Physical Memory 591.12 MB

Total Virtual Memory 2.00 GB

Available Virtual Memory 1.96 GB

Page File Space 2.39 GB

Page File C:\pagefile.sys





"Jose" wrote in message

news:a36a9386-397f-451a-bc01-af648934b982@w12g2000yqj.googlegroups.com...

On Jun 18, 4:00 pm, "Amanda" wrote:

> Thanks to all who replied.

>

> Ben - Just bought a new keyboard and tried, nope f8 & f9 still doesn't

> work.

> Only working options are f1 and delete. Yes, i did save after changing the

> bios setup. Doesn't work.

>

> Jim - Yes I have anti virus installed and schedule to update and run

> everyday. But the time set back because of the checksum error has made it

> run at rather untimely. I do check the history once in a while to make

> sure.

>

> Linus - "After you replace the CMOS battery, you often need to reset the

> CMOS. Usually you do this by taking the battery out, installing it

> backwards

> in its holder" I don't quite understand this, do I take reset after I take

> out the battery or after I replaced the battery? I hope you mean to take

> out

> the old battery, drain off with the old battery and then replace with new.

> Is that it? I'll try that.

>

> I seem to think that the motherboard is dying. Either I get a new one or I

> just punch F1 each time I turn on the computer and ignore the time.

>

> Regards

> Sonny

>

> "Linus" wrote in message

>

> news:DFD0CEE0-DB19-4503-B0D7-DFC103B71494@microsoft.com...

>

>

>

> > After you replace the CMOS battery, you often need to reset the CMOS.

> > Usually

> > you do this by taking the battery out, installing it backwards in its

> > holder

> > for 20 or 30 minutes to bleed off all the current. Then just take the

> > battery

> > out, turn it around and install it properly.


>

> > Some mother boards have shorting terminals near the battery that let you

> > bleed off the current without removing the battery, check your users

> > guide

> > for instructions on how to use those.


>

> > Either way you do it, when you restart your computer, the OS will reload

> > the

> > CMOS with clean settings that may solve your problem.


>

> > Linusverl


>

> > "Ben Myers" wrote:


>

> >> "Amanda" wrote in message

> >>news:#aXpUlHDLHA.4400@TK2MSFTNGP05.phx.gbl...

> >> > Ben,

> >> > I've just rebooted and tried hitting the F8 button, doesn't work,

> >> > comes

> >> > up

> >> > to the same screen with the f8 f9 f1 and delete option.


>

> >> If you are saying that pressing the F8 key does nothing when the

> >> message

> >> is displayed, try a different keyboard. If you are getting into the

> >> BIOS

> >> setup,

> >> make sure you are saving the changes, since this typically is not done

> >> automatically.


>

> >> Ben

> >> .




I don't see where you have identified your system well enough (the

right questions have not been asked).



You can try things all day long - how it that working out?



If your system boots, do this and we can identify the motherboard and

then you might get some better ideas:



Please provide additional information about your system:



Click Start, Run and in the box enter:



msinfo32



Click OK, and when the System Summary info appears, click Edit, Select

All, Copy and then paste the information back here.



There will be some personal information (like System Name and User

Name), and whatever appears to be private information to you, just

delete it from the pasted information.



This will minimize back and forth Q&A and eliminate guesswork. (too

late for the guesswork part).
 
Of course. That is a protective device. It is to protect the item from

people who install batteries

backwards. I repeat, that is the dumbest thing you can do (Put batteries in

backwards)..

"Paul" wrote in message

news:hvivo7$41h$1@speranza.aioe.org...

>> > "Jose" wrote in message Where can I read about

>> > this method of resetting the CMOS by inserting

>> > the battery backwards for 20 to 30 minutes to bleed off the current?


>>

>> Unknown wrote:

>> You can't read about putting the battery in backwards because it doesn't

>> exist. That is about the dumbest thing you can do on anything with a

>> battery.


>

> There is a diode in that path, that also functions as

> reverse polarity protection. Go to page 18 of this document, and

> look at diode D3 in the bottom left hand corner of page 18. if

> the battery were reversed, the D3 diode would be reverse biased,

> and the current could not flow.

>

> http://www.intel.com/design/chipsets/designex/BXDPDG10.htm

>

> Also, as a result of that diode, plopping the battery in

> backwards, isn't that effective. The provided CMOS jumper,

> applied to the three pin header shown in that schematic, is

> effective at doing its job. It won't take long to

> drain the CMOS well. It's a bit harder, on the motherboards

> that provide solder pads and no header pins, to consistently

> hold the connection long enough, to complete

> the draining. But if you have a header to work with,

> that is just as good at sitting in a holding pattern, as

> jamming the battery in backwards.

>

> Paul
 
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