My computer won't start up!

All of a sudden it just won't start. i hear it running and see the modem light up and whatnot, but it seems as though other things aren't working. the keyboard doesn't light up, the mouse won't either, and the monitor is blank. i have anti-spyware and anti-virus software running, so i don't think any of that is the case.

My first guess is that is needs to cool down. it's been on for days. when i turn it on in a few hours, i'll see what it does. i'm just frustrated and i don't know what to do :/

i knew trying to fix that computer was too good to be true. i'm probably gonna have to fix the one that busted up in the first place. FUCK.

ah well. i'll see what happens. probably just a power problem. it's had problems before in that area.

EDIT: well well well. i think i sorta know what's going on. it IS a power problem. i unplugged and replugged the power cord in the computer. and it started up again. i think this is the beginning of a bad nightmare :/ so i think i'll be doing that whole hibernation/sleep thing until i can get it checked out. i still am, however, open to any of your ideas