black screen

[ddwbi0]

Yesterday when I turned my computer on, it booted just fine. Windows started loading its blue bar, but after that the screen just stayed black. Didn't restart or anything, just black. Today, I try turning it on again and now nothing shows up on the monitor at all. Not sure where the problem might be. I am using a ati 850xt. TIA

 

[amdskip]

List out your complete specs please including your power supply. Do you have a thumbdrive inserted in your computer right now because I know mine won't boot with mine inserted.

 

[ddwbi0]

AMD 2600+ o/ced to 3000+ (problem still exists when i revert back to normal)
zalman fan
Asus a7n8x-e
3 sticks of 512mb corsair valueram
ultra x-connect 500w psu
ati 850xt
3 hdd's
2 16x DVDR drives
No usb plugged in. Thanks