Did installing too much RAM stop my PC reading HDDs?

[Microsoft Windows]

I put 8+2 GB RAM in my Toshiba T130-11H. I removed the HDD, turned it on and got a black screen. I found out it only supports 2+2 GB so I put back the original RAM and HDD and it got stuck at POST. I restarted and it booted, worked for about 30 minutes and gave a BSOD. I restarted and got 'Check cable connection! Operating System not found'. Is this a coincidence?It gives the same error with the HDD from my other laptop. My other laptop works with the HDD from my Toshiba. The SATA connector doesn't look damaged.

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