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

GTKINC
GTKINC asked
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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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CERTIFIED EXPERT
Top Expert 2012
Commented:
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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Author

Commented:
Will try the PS.  Thanks and I'll repost.

Author

Commented:
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?
CERTIFIED EXPERT
Distinguished Expert 2019

Commented:
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
CERTIFIED EXPERT
Top Expert 2012

Commented:
I would say it's the motherboard.

Author

Commented:
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.

Author

Commented:
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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