System starts then shuts down seconds later

Hi,

My second system is a P4 desktop. It was working fine, no symptoms of any problems - then yesturday it would start briefly and then completly shut down after about 5 seconds. No POST beeps at all, just shuts itself down.



Here's what I've done:



Switched the PSU with a known good one, same problem.

Removed video card and all RAM, unpluged power from all drives - same problem.



Is there anything besides an overheating CPU that can cause this? Both fans spinup at startup without problem.



All ideas welcome.
4 answers Last reply
More about system starts shuts seconds later
  1. Could be MB but definitely sounds more like the CPU.
  2. How would I go about confirming the CPU (without having a replacement to use)?
  3. Maybe one of the regulars knows of something, but the only options I can think of are Your CPU in another MB or another CPU in your MB. Sorry.
  4. cmichael138 said:
    Maybe one of the regulars knows of something, but the only options I can think of are Your CPU in another MB or another CPU in your MB. Sorry.


    Thanks cmichael138, but I don't have that luxery.
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