That was what my eMachines Desktop is doing. It has being doing this since around September last year. The weird thing is that the power button would stay illuminated. It is not like a Windows shutdown, but an immediate power off. I would then just unplug the power cord, wait a few minutes and then plug it in and boot up the PC.
That was until a week or so ago when it just didn't come on after I plugged it again. Of course I thought the power supply had gone for good, and started hunting for a new power supply. The next day I tried it the PC again, and it started up fine. The only problem now is that it only seems to run for a few hours before it shuts down without warning. The strangest thing is that this always happens when I'm not using the computer.
Anyway, after much web research, this seems like a there may be a few possible solutions. Sometimes just blowing out dust from inside the computer case does the trick, or a new power supply solves the problem. Then there are other possibilities like problems with the motherboard, or the CPU fan - that's when troubleshooting is just too complicated (and expensive) for a budget PC.
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