Blank screen on boot

[RabidDog]

Ok my desktop (WinXPPro, DualCoreAthlon, 2GB RAM) has been acting weird the past two weeks. When I try and turn my computer on it sounds like it is starting up but my monitor just remains blank with a blinking light.(Obviously saying it is getting no signal.) and my keyboard never lights up or blinks or anything. However, if I flip the power supply switch off and on it will boot just fine. Ive checked cables and video card to be sure they are seated and connected, and now I am getting worried about it!

Thank you in advance for any help!

PS. I am overclocking my 3600+ to almost 3Ghz and so I was worried that had something to do with it. But I bumped everything down and it still does it so I guess that is not the problem?

O... I also think i remember it shutting down while I was on it and doing the same thing, though Im not 100percent sure.

[RabidDog]

**UPDATE**

I ended up reseting CMOS and there was no change. I then decided to just take everything out and put it all back together. I took every piece of hardware out, including Motherboard and CPU and cleaned everything and put it all back together. It still does the exact same thing.

If I turn the power supply on and off it will boot fine but if I just shutdown and then press the power button to start it up again, everything spins up and appears to run fine but I still get the black screen. dont think it ever makes it to windows.

So I was thinking, does the problem reside in my PSU? Maybe it went bad, a capacitor not holding a charge or something? But if everything turns on I dont know how that can be. Im getting frustrated and I guess I will call Antec tomorrow. Any input is still appreciated.