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So I'm using the motherboard: 'h8Dgi-f'.. Now, I plug the ATX power supply in, and the 'on switch' onto where it should be. I press on. The PSU fan goes on for a millisecond, then stops. Then I have to unplug it, wait 15 seconds, re-plug it in to the motherboard. I've tested this PSU on other machines and it works fine.

Before what happened: I put in the CPU, everything started to work, except for the screen - so i rebooted a couple of times. still didn't fix it. then I rebooted it again, and the fan randomly stopped.(PSU fan) and from previous experience I knew this was some sort of short circuit.. so I tried taking EVERYTHING out but the ATX powersupply, but it still flashes off when u turn it on. and when u wobble the ATX powersupply cable, the fan comes on, goes off, goes on, goes off very quickly.(so wobbling it resets it i guess) - BUT when you do that, smoke comes from the motherboard! right next to the 8pins next to 'JF1'

Does anybody know any way to get it to work again? I can provide more information if needed.

Thanks

EDIT: It's not completly gone, the 'UID' blue light works, and the 'wake on lan' flashes.. I just can't turn it on..

EDIT: So I've just tested the motherboard with a really old PSU, and no smoke at all. afaik, no short either. but the PSU is so old, the cables are like 1 inch long so I can't connect everything to test it.. it may be a coincidence, though.

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are there any obvious burn mark? – Journeyman Geek Aug 23 '12 at 8:55
Not that I know of.. but in this picture: alexjleon.net//o/IMG_6568.JPG The black little boxes, one of them seemed a bit 'wet' color.. – user1272728 Aug 23 '12 at 8:59
"smoke comes from the motherboard!" suggests permanent damage to the motherboard and that the PSU is either the wrong type or faulty. – RedGrittyBrick Aug 23 '12 at 9:31
I would just replace the PSU if it is causing your motherboard to smoke. Actually I would just replace both items to be honest. – Ramhound Aug 23 '12 at 11:50

1 Answer

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i've seen incompatibilities though not like that but anyway, still you can treat it like that, a possible incompatibility. Label the psu that failed with the motherboard, write on the label "seems to fail with mbrd make-... model-....". And since your other psu works with it(I understand its cables are too short for your liking), but the fact that it works indicates that maybe another psu will too. but you'd need to buy another - with cables long enough such that they are to your liking.

Added- Now that you've tested that problematic PSU further with an old computer, and now found it fails with 2 different motherboards, it would be wise to chuck it out. It's not good for hardware to use a bad PSU whether it makes the computer function or not.

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Yep, I just tried the long cable PSU with a really old computer, and it seems to spin for 4 second, going lower every second, then go back up, adn the computers light goes on and off with it.. seems that that PSU is dead! – user1272728 Aug 23 '12 at 9:27

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