PC Not Starting - Burned Out 24pin Connector - Replace Mobo?

baj3171

Reputable
Dec 28, 2015
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Hi,

I brought a second hand PC that was not powering up, suspecting it was only a faulty PSU. The PSU was indeed faulty and I have replaced it, but the system still will not start up; the fans on the water cooling unit spin for half a second and then stop.

When I replaced the PSU I noticed the plastic around the two 12V pins on the 24pin connector were blackened and I had to force out the old PSU's connector and clear the fused plastic out of the mobo's connector. The two pins still look quite blackened though.

I have tried clearing the CMOS.

If I disconect the mobo and use the "paper-clip trick" on the PSU, all the fans start fine.

I figure the 2 main suspects are the male 24pin connector on the mobo or the mobo itself. Which means I'll either have to clean up/replace the connector or replace the mobo.

So my questions:

1) How would I clean up the connector pins?
2) Where could I source a replacement connector, could only find a couple of US sites selling them (not too keen on soldering, but sooner that than new mobo)?
3) Worst case, buy a new mobo; any recommendations on what I can replace a Asus p7p55ws supercomputer with that will support 3 graphic cards?

Some specs:
- Water cooling system (all gpus and cpu) - appears to be functional
- Two extra case fans - working
- 3 gpu cards, all ATI Radeon 59XX (look like 5970s), I only intend to move forward with 2 fornow though - status unknown
- Mobo is a Asus p7p55ws supercomputer - possibly faulty
- Not sure on the CPU, previous owner claims AMD, but mobo is a socket 1156
- Ram 2x4GB SK Hynix PC3-12800U DDR3-1600 - pulled from working PC, so should be ok
- PSU, corsair RM850x

The machine was kept in storage for 3 years prior to me buying it.

Any help/advice would be appreciated.

Thanks
 
Solution
I am sorry to let you know that there is no need to clean up the connector pins on the motherboard or the old power supply. When this situation happens, some or more components on the motherboard are usually damaged or severely degraded. The stability of the hardware is the most fundamental thing a new system should have, and all unstable and faulty hardware should be replaced. The best solution is to replace the motherboard that will work and revive the rest of the parts and the entire system.

The cpu is one that's compatible with LGA1156 socket, and it's an Intel CPU. If the pc can't be returned, I'd recommend to get a used motherboard with Intel P55 chipset on eBay from a reputable seller. Then, test all components carefully. In...

George Phillips

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Jun 17, 2015
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I am sorry to let you know that there is no need to clean up the connector pins on the motherboard or the old power supply. When this situation happens, some or more components on the motherboard are usually damaged or severely degraded. The stability of the hardware is the most fundamental thing a new system should have, and all unstable and faulty hardware should be replaced. The best solution is to replace the motherboard that will work and revive the rest of the parts and the entire system.

The cpu is one that's compatible with LGA1156 socket, and it's an Intel CPU. If the pc can't be returned, I'd recommend to get a used motherboard with Intel P55 chipset on eBay from a reputable seller. Then, test all components carefully. In the best scenario, only the old motherboard is not working, and the rest components can still work with the new motherboard.
 
Solution

baj3171

Reputable
Dec 28, 2015
2
0
4,510
I think you're both right. I cannot afford a new mobo, so I have stripped the machine down and put my old AM2 board in the case with one of the GPUs. Not as big an upgrade as the above would have been, but better than I had previously.

Thanks for posting and have a happy new year.
 

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