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Dead CPU or dead motherboard

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myrgjorf   01-30-2008 at 06:53:58 PM

Expert help needed

My daugther's pc (which used to be mine) has stopped working. I have nailed the problem down to a dead CPU or a dead motherboard. If it's a dead CPU I'll buy a new. If it's a dead motherboard I need a new computer.
Specs: AMD3400+ S939, MSI 7075 MB (oem), DDR400 RAM, Geforce 7800GS AGP. I'd like to reuse the GeForce as it's quite powerfull for her gaming.
Symptoms:
- All connected: fans starts running for ½ second, then PSU cuts off
- No CPU, all else connected: fans keep running
- CPU, 4 pin PSU connector to MB removed, fans keep running.
- RAM removed: same pattern as above.
All peripherials disconnected, another AGP graphics adapter connected.
I can't find another S939 CPU and I don't wnat to buy one if it will not work.

I think it is a dead CPU. Agree? Is the MB damaged?
Should I go the half way with a ASUS P5VDC-X ?

Thanks
Bjarne

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benzene   01-30-2008 at 07:27:07 PM
- 0 +

I think its perhaps more likely that you have a dead PSU, can you swap it out for another to test?

Reply to benzene
dragonsprayer   01-30-2008 at 07:54:07 PM
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why not suspect the psu - did your hook another psu to the system?

------------------------------ http://i63.photobucket.com/albums/h138/4rothrocks/WarpedSystemsAnimation-1.jpg
 Reply to dragonsprayer
mike99   01-30-2008 at 07:56:50 PM
- 0 +

Try PSU first. Only way to tell between CPU & motherboard is by swapping. Check if local computer shop can test for you. If it IS CPU, you can still get Opteron 144 for about 52GBP which is a drop-in replacement, or look on Ebay.

Mike.

Reply to mike99
myrgjorf   01-30-2008 at 08:13:09 PM
- 0 +

Thanks all. I forgot to tell that I did try another PSU with exactly the same results. So I'm down to CPU or MB.

Reply to myrgjorf
Mendoza   01-30-2008 at 08:50:07 PM
- 0 +

Sounds more like a PSU unit or Motherboard Issue.

CPUs that aren't overclocked by either Intel or AMD run for about 8-10+ years if not more as long as the fan on the cpu is spinning ( lets say dust and pet hair can clog up a fan easily). SO I'd almost 100% rule out the CPU.

Most likely either the PSU capicitors are dead/dying or your motherboards capicitors are dead/dying.

To identify if you motherboard is bad. Go look at the 4 pictures on the right of this page.
http://www.badcaps.net/pages.php?vid=5
The page has a few pictures to identify what bad capicitors look like.


If any of your motherboards capicitors are buldging or leaking fluid. Then its your board. But on a side note you can still find 939 boards (although very limited selection from newegg, tiger direct or zipzoomfly.....and last but not least ebay)

The PSU you can try hooking up a different one and see if the problem persists. But unless you know what you are doing I don't recommend opening up the PSU to look inside to see if its capicitors are dead, only because a PSU can still hold a charge for sometime even after being shut off and unplugged. Gettings zapped by a unhooked up PSU can sux ( i knowz)


Message edited by Mendoza on 01-30-2008 at 08:52:15 PM
Reply to Mendoza
timaahhh   01-30-2008 at 08:51:26 PM
- 0 +

I would take it to a tech shop and ask em if they can do a post test. 1/2 seconds might not be long enough however to run a post test. A post tester is a little PCI card that can run quick diagnositics and tell a tech the problem. If they try to charge ya I wouldn't pay more then 15 bucks, the post tester is sorta expensive for good ones, but really requires no work from techicians.

That may tell ya where the problem lies.

Reply to timaahhh
Mendoza   01-30-2008 at 08:53:20 PM
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AH just read your post about using a different PSU.

Ya def you board then.

Reply to Mendoza
Smoked Turkey   01-30-2008 at 10:15:40 PM
- 0 +

99% sure it is not the CPU. The only time I have seen them go bad is Apples G5 chips that would cook themselves.

Reply to Smoked Turkey
superbigsoft   04-28-2008 at 04:48:52 PM
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Hi myrgjorf, could you solve your problem ? Can you share it with me ? Is it a dead CPU ?

Reply to superbigsoft
myrgjorf   04-28-2008 at 09:45:33 PM
- 0 +

Hi superbigsoft

We decided by buy a gameable laptop for my daughter instead of trying to repair the old one. So I don't know if it was the m/b or the CPU.

Reply to myrgjorf
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