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Rebuilt old PC, posts then turns off


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booey1's Avatar
booey1 booey1 is offline
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22-Jun-2012, 10:04 AM #1
Rebuilt old PC, posts then turns off
Hey

So I've rebuilt an an old pc.

It's an old Athlon 1400 CPU, 300w psu and I'm not sure what the mobo is.

It turns on, fan kicks in, psu seems to work. It posts with a single beeb, displays the GPU (Geforce 5200 - 32mb) and then just turns of.

I tried replacing the cpu thermal paste in case it was over heating, but no luck.

I have checked the HDD in another computer and it boots fine.

Any ideas?
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22-Jun-2012, 03:52 PM #2
With that old of a system, the very first thing I would do would be to inspect the board for leaking capacitors. Get a bright light and see if you find any that look like the pics below.
Attached Thumbnails
Rebuilt old PC, posts then turns off-bad-cap.jpg   Rebuilt old PC, posts then turns off-badcaps-choyo.jpg   Rebuilt old PC, posts then turns off-badcaps-tayeh-4.jpg  
booey1's Avatar
booey1 booey1 is offline
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22-Jun-2012, 04:04 PM #3
So I'm looking for anything with slight crystalisation? Then what?
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22-Jun-2012, 04:21 PM #4
If you find any that look like those pics, you have found your problem.

If they ALL look ok, then you are going to have to start swapping parts with known good ones to find the failed part.
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22-Jun-2012, 04:23 PM #5
One other note it can sometimes be almost impossible to see a failed cap until you pull the board out of the case. I have had a few mb that I could not see the bad caps until the board was out of the case and sitting in front of me.
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22-Jun-2012, 04:29 PM #6
Quote:
Originally Posted by booey1 View Post
Hey ...So I've rebuilt an an old pc.
What does "rebuilt" mean? Just what did you change in the old system? Was it running before the rebuild? Have you tested the power supply? Along with the motherboard, that would be the other leading candidate.
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02-Jul-2012, 04:42 PM #7
Thanks for the input.

I've added in an AGP GPU and HDD, but otherwise it's all the same. It was not running before the re-build I don't think, but it would have been 2+ years ago. How do I test the psu? I've looked at the capacitors, but I'm going to look again now.
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02-Jul-2012, 04:49 PM #8
Quote:
How do I test the psu?
Quickest way is to swap in a known good pw supply. You can use a tester however these are not perfect. Here is a link to a pw supply tester.
http://www.newegg.com/Product/Produc...82E16899261023
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