Hello,
The symptoms are:
While casually using the machine, monitor enters standby, hard-disk can be heard spinning down, machine remains on.
If the machine is powered down manually by holding the power-button down it will not boot upon switching back on. In order to get the machine to boot again, i must reset the bios.
If by chance the machine does boot, it freezes solid at POST or if it reaches the Windows loading screen it will reboot itself.
I have loaded optimized defaults into the bios, upon entering Windows i ran Prime95, it crashed within 15 minutes with a blue-screen.
The only link between my recent problems and something i've done is the overclocking of my graphics card that has since been put back to stock.
I am now on my machine writing this thread, at the moment i only have one memory module and my HDD attached to the motherboard, i've removed all USB peripherals, both my CD-ROM drives and my second HDD.
My guesses would be the PSU and of course due to what i've said above my Graphics Card.
What do you guys think?