PC is on, but it's not displayed on my monitor?

I turned my PC on and it's running, but it's not displayed on my monitor. I tried a different monitor, a different cable for displaying, and different power cords, but its still not working. I noticed that even though my keyboard is plugged in, it doesn't seem to be working. (pressed the caps lock and num lock buttons to see if they are on.) my mouse however is glowing red so i think that still functions. When I turn off the computer and turn it back on, sometimes it just turns off immediately. My friend thinks that my computers power supply is messed up. If thats the case, then how do I solve this problem?

Armon2013-08-26T20:53:34Z

Press the windows button on your keyboard ( the one right next to control) then you press p. Try that a bit and it might work

Nic2013-08-26T18:46:12Z

Go to where you bought it and see if they can help. Or, call the warranty number and have your computer providers fix it. I think what your problem is that either A: Your monitor(s) burnt out and you have a serious virus. or, B: Your monitor(s) is/are fine and you have a serious virus.

?2013-08-26T18:06:18Z

If ur pc is running its power supply (smps) thats olryt then
i guess u should check out ur ram first place it with another and c weathr it displays