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8-Pin ATX problem, Asus M2N32-WS Professional


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#1 dfv8

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Posted 10 July 2011 - 08:57 AM

Hello, can your experts help?

I have a problem insofar as when the 8-pin ATX 12 volt supply is plugged into the motherboard socket, the machine shuts down about two-seconds after the attempted switch-on.

If I unplug the ATX connector leaving the 24 pin EATX power plug in place, the machine continues to run. I've tested the 10 month Antec EA650 psu with a multimeter and all outputs are OK.

Opinion welcome - is it time for a new motherboard? And what would you recommend as I'd like to re-use my existing components?

Regards.

Asus M2N32WS Professional
AMD Athlon 64 X2 5600
Antec EA650 psu
Corsair TWIN2X4096-6400C5C 4GB 800MHz C5 DDR2 Memory Kit
Antec P180 case
Windows XP Professional
3D Connexion Spacepilot
Enermax Aurora keyboard
WD 250Gb hard drive

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#2 cryptodan

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Posted 10 July 2011 - 08:59 AM

Have you reassembled the PC outside the case on a cardboard box or a rubber mat?

#3 dfv8

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Posted 10 July 2011 - 10:21 AM

Have you reassembled the PC outside the case on a cardboard box or a rubber mat?


Hi, thanks for the reply,

No, I haven't tried that,what would be the reasoning behind that?

Thanks.

#4 cryptodan

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Posted 10 July 2011 - 10:33 AM

To remove all possibility of a short on the motherboard and case.

#5 dfv8

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Posted 10 July 2011 - 10:54 AM

OK, understood.

I'll try that next - will be tomorrow now as it's 5 p.m. over here in the U.K. and I'm about to go to the movies to see the film about Ayrton Senna.

Will get back to you with the results.

Cheers.

#6 dfv8

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Posted 11 July 2011 - 02:34 PM

Good afternoon Cryptodan,

Ok, I've removed the motherboard from the case and did as you suggested.

The result is exactly the same i.e. powers-up OK with the 24 pin Molex connected only, but when I connect the eight pin Molex and the 24 pin and try to restart the computer, it switches off after about two seconds. Hard drive spins-up ok, as does the graphics card fan. I also disconnected both and tried again, but the same result.

One other odd thing happened, and I don't know if this is significant - I tried to turn the machine off twice via the front-panel reset button a couple of times, (held down for four seconds) then when I released it the machine turned on again before shutting down with the fault. Just thought you should know.

Best regards,

dfv8

Edited by dfv8, 11 July 2011 - 02:34 PM.


#7 cryptodan

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Posted 13 July 2011 - 08:53 AM

Check the CPU now, as I am think its now bad.

#8 dfv8

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Posted 13 July 2011 - 03:15 PM

Hello again,

Your diagnosis appears to be correct. I have removed the processor, powered-up the machine with the processor socket empty, and the machine continued to run. Unfortunately, I don't currently have a replacement processor to hand.

Secondly, with both power plugs connected the reset button doesn't power off the macchine, but does so if it's the 24 pin Molex connected only.

Thanks for your help, it's really appreciated.

dfv8

#9 cryptodan

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Posted 22 July 2011 - 02:02 PM

I would suspect the motherboard. Please do not send me PM's instead reply to your post with new information.




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