Okay so I have a Dell Precision 360 that I run as a MythTV/FileServer.

The other morning when I woke up I found that I couldn't connect to it, when I went to investigate, the machine was off, and would not power on, the power button was flashing yellow. I unplugged it, and went to work.

That night I plugged it back in and found that it powered up once and beeped, I turned it back off and rebooted, it stayed on.

-After about ten minutes it had turned off again, I unplugged it to diagnose later.

Today i plugged it back in (connected a monitor today), booted it up and saw a message after the BIOS Alert! Previous Voltage Failure, i pushed F1 and continued to boot. After abut five minutes the machine powered off again. I could no longer boot. I left it unplugged for a few minutes and could boot again.

I was thinking, this is probably bad memory; I went ahead and removed all of the memory and PCI cards from the computer, and began adding one at a time, the computer power button never went green. Now, if I give it a break it will boot but it dies after a few minutes and this repeats.

What is the problem, faulty PS?, mobo?

Anny suggestions would be great, I just don't want to order the wrong part.

Any bios health screens that might show voltages?

Sorry it took me so long, but I do not see any bios health screens.
I'm thinking that it stays on until the power supply overheats and turns off?
I have ordered a new power supply from Newegg, hopefully that solves it.