Hardware. Intel Core 2 duo Gigabyte p35-ds3l 2 gb crucial ballistix geforce 8800gt 2 Hdds 1 DVDRW antec sonata 3 w/500W earthwatts PSU win XP I have had this setup for over a year now and it has been working fine, there have been no symptoms leading up to my problem. Computer froze, and on reboot would not POST, with no error codes. Fans spin up, but no signal to the monitor, Normally at boot GPU fan revs up to highspeed momentarily than ramps back down, but now it revs up and stays up, reset button does nothing have to hold power button. PSU fan is not spinning during boot up but I am not sure if this fan is heat activated or not. I have unplugged all non-essential devices leaving just RAM, CPU, GPU. still no joy. The last thing I have done is remove both RAM modules, at this point I do get either 3 beeps, then reboot and continuous. Or I just get continuos beeps. And the GPU fan does ramp down. I have tried both Ram modules in all possible configurations to rule out Ram slots, always no beep codes with Ram plugged in. So this leads me to believe it is either the PSU, or RAM is there any test I can try to tell which one, short of swapping as I have no spare parts handy.