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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
ID: 17813038
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
ID: 17813162
Will try the PS.  Thanks and I'll repost.
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by:GTKINC
ID: 17815803
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
ID: 17817858
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
ID: 17818331
I would say it's the motherboard.
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by:GTKINC
ID: 17822545
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
ID: 17826567
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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