LogFAQs > #946518597

Try replacing the CMOS battery in the motherboard. Or at least use the CMOS jumper to reset it.

Twice in the last 18 months my computer wouldn't turn on after a power outage, pressing the power button yielded no response. Thought my power supply could be dead, but tried those first and it worked. Second time was a couple of months ago, and just resetting it worked, and I bought batteries to replace it the next time.

Also, I have a Sandy Bridge i3, so my computer is the same age as yours.