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Is this power supply fan supposed to run constantly

I have a Compaq Presario 5000 Pentium 4.  Lately it has been shutting down on its own.  I noticed that the power supply fan never comes on.  In my experience, at least with store bought computers that the fans almost always run.  Never the less I tried it with another aftermarket power supply and it wouldn't even power up.  I'm not above buying another one to fit it but I just wanted to see if anyone else knew whether or not the fan should at least kick on at some point.  Thanks in advance.
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Callandor
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I would agree with you on the motherboard having issues but once you turn everything back on the machine runs great and passes promark burnin test.  As for the power supply and the after market one not working, I've seen that before with various Dell power supplies and them needing to be an OEM power supply.
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rindi
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I've ordered another Power Supply.  I will repost once I recieve it.  I opened this one up, blew out the dust and still no dice.
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Replaced the power supply with an exact compaq supply and that fixed it.  Thanks for your assistance.
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rindi
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your welcome