Why won't some of my fn buttons work?

[Ryan Berg 1249]

My f5, f6, f7, and f8 keys do not register. I used a keyboard tester and using all the other keys worked except those ones. Whenever I press them nothing happens. I do not have function lock on and the other function keys work. It started out as only my f6 and f7 keys not working (which happen to be my volume up and down buttons) and now its also my f5 and f8 (which are the mute and rewind buttons).

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