Hmm, i have the 550w model of that PSU, very good one...should work just fine.
you couldn't possible test a different monitor could you? And if you leave the PC running for a bit, does it beep at you? Or does it keep running.
If it keeps running, wait a bit, and try to login as you normally would with they keyboard. Make sure speakers are on and see if you get a login sound or anything.
It looks as if you video card is not working, or your monitor has stopped working. Or you are just overlooking a power connection somewhere. Hard to tell on the interrnet lol.
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Compaq Presario V5000 laptop