600Mhz P3 won't boot unless turned off for a while

I have an old Gateway 600 Mhz P3 that I leave on all of the time.  If I turn it off, it won't reboot unless it sits for a while.  For example, if the power goes out, it won't start up right away.  I can hear the fan and drives spin, but the monitor will not power on.  Sometimes it will work after being off for 5 minutes, sometimes it has to sit much longer.  Does anyone have any idea why this might be happening and what I can do to remedy the problem?  Thanks.
wmiddleAsked:
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BjornEricssonCommented:
This sounds pretty much like powersupply issue, if possible swaptest with another powesupply.
You can also check for potential heating problems and the easiest way to spot any problems is to run HWmonitor, http://www.hwmonitor.com
Hope this helps,
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BjornEricssonCommented:
Sorry, the link should be http://www.hmonitor.com/
This program checks your CPU as well which might be running a bit hot.
There are several possible causes to a problem like this.
Just let us know how it goes,
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wmiddleAuthor Commented:
Currently I can't get it to boot at all.  I'll try swapping the PS
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wmiddleAuthor Commented:
Okay, I plugged in another power supply and it booted.  I then plugged back in the original power supply and it boots consistently.  Perhaps it was a loose connection?
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BjornEricssonCommented:
Might have been the ATX connection which failed you, glad it worked.
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