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Computer shuts down

my computer has an ABIT SA6R motherboard, 256MB of RAM, 20GB Drive, with Pentium III 866. From time to time, it suddenly shuts itself off. Tapping the case occasionally causes it to restart, and sometimes when restarting it will power on, then off, then on, then off, etc. or there will appear to be power but no video signal. What are the causes of this problem?? How would I solve it?
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palmad
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palmad
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1 Solution
 
cookreCommented:
The comment about case tapping would seem to be the clue - something is loose somewhere.  

Go over every cable and connector (inside and out) making sure they're snug.  The same goes for cards, chips, and MB mounts.

Also look for a wire getting pinched by the case itself - in particular those wires and cables you have to cram inside when you close the case or slide in a panel.
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palmadAuthor Commented:
I tried checking everything inside but it still has that problem.
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cookreCommented:
How about jiggling eveything one item at a time - including the MB and power supply?

How about tapping the backplane like you do the case?

At least you can be reasonably sure the problem is with a poor mechanical connection and not with a defective trace somewhere.

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palmadAuthor Commented:
checked it out awhile ago... but didn't found anything loose or something.... any more suggestions?
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palmadAuthor Commented:
checked it out awhile ago... but didn't found anything loose or something.... any more suggestions?
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palmadAuthor Commented:
checked it out awhile ago... but didn't found anything loose or something.... any more suggestions?
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cookreCommented:
Was it like this since it was built?
Did it start doing this suddenly or gradually?
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1175089Commented:
and one unusual cause, look carefuly may be front cover slightly press reset button and every movement may reboot your PC..
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slink9Commented:
The question says "shutdown."
It is just an immediate power off, right?  It then comes back with the bad shutdown message and scandisk?
Have you tried a different power supply?  Have you tried running it without the side panel on?  There could be a "dead man's switch" which is supposed to verify that the side panel is on and it is malfunctioning.
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palmadAuthor Commented:
thanks I've solved it!!!
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slink9Commented:
But what was the problem?  We would like to know.  We are here to gain knowledge and know what to do if we see this problem elsewhere.
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