Unfortunately with Windows 8 they decided that you don't need to be able to get to safe mode simply so F8 doesn't work. It actually takes a ridiculous amount of effort to get to safe mode on Windows 8- and it seems you can only do this if the computer actually boots up in the first place. It's annoying, but not actually anyones fault. You see it doesn't work... because your computer is too fast and the way they designed Windows 8 to boot unless you have a slow computer it doesn't have time to see you even input a keystroke before the OS has started opening.
There are ways to hack it, but I don't recommend it.
Anyway, like MB said check the individual pieces of hardware and make sure it's plugged in. Blow out your case. I know it's obvious, but you never know... make sure you clean any dust off the heatsink (assuming you have one and it's not liquid cooling or something).
If you have a recovery or repair disc you can try running that (people often think they don't need one, so they ignore making one, but cases like this are reasons why it's important).
If everything is in place, and it still doesn't boot up, or the repair/recovery doesn't work, something could need replacement or reinstallation. That is the last case scenario, but worth noting in case it happens (I hope it doesn't, that more than sucks when that happens).
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