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Why does my machine cut off but the PS and HD still remain on?

Posted on 2006-10-26
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Last Modified: 2010-04-25
I have an HP 533w Pavilion.  After 45mins to 2 days the machine will shut itself off but you can still hear the hard drive spinning and the power supply is still on.  If I pull the power cord and plug it back in.  I thought at first the video card was the problem and replaced it.  That didn't fix anything.  I've tried 3 monitors and they all eventually do the same thing.  Thus ruling out the monitor issue.  Thanks in advance.
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Question by:GTKINC
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Callandor earned 500 total points
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I would consider the power supply, and after that, the motherboard.  Power-related problems are usually due to failing capacitors on either part.
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by:GTKINC
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Will try the PS.  Thanks and I'll repost.
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by:GTKINC
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Installed the new PS and the machine has ran for about 6 hours but is now doing the same thing, think we can safely say it is the motherboard?
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by:nobus
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i would test first with the minimum connected :
mobo + cpu + 1 ram stick, video card, 1 disk, keyb + mouse.
if it still happens, swap the ram.
you can also test the disk with one of these : http://www.disk-utility.com/hard-disk-low-level-format.html
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by:Callandor
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I would say it's the motherboard.
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by:GTKINC
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Very confident now that it is the motherboard.  Paid closer attention to the mobo and about 10 or so capacitors around the processor socket have leaked on top.  Put in a replacement board and so far so good.  I didn't notice the leaking prior to posting sorry.
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by:GTKINC
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Thanks for the information and seconding of my motion.  This is the first board I've seen actual visible damage to the capacitors.  
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