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I was changing my desktop case and after I got all parts together and turned it on, the motherboard started smoking next to the 4-pin power cable (the one that provides power to the processor). I'm not sure which power suply cable actually started smoking because I turned it off really quick.

Im puzzled because the power supply pins are built in such a way that's nearly impossible to connect anything wrong, and it's not the first time I do it, I'm not unexperienced. I suspect one of the parts where not working properly, and that caused some sort of short circuit.

Now my question is: How do I know which are the parts affected so I can replace them?

I suspect the motherboard, the power supply and the processor may not work anymore, but it's just my guess.

What do I do?

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  • check the motherboard isn't shorted on the case. Like say if a screw got dropped during putting together and wedged behind the board and the case. -- I have done this, it sucked. (and it was subsequently permanently broken)
    – Sirex
    Dec 4, 2014 at 23:46
  • Oh dear... I'd start with eyeball mk1 and the sniff test. There's usually some burn damage when the magic smoke escapes.
    – Journeyman Geek
    Dec 5, 2014 at 0:05
  • Can you get it to the point where it will boot up a diagnostic system. There are plenty available which will go through your system and do hardware checks, not using Windows or Linux.
    – mdpc
    Dec 5, 2014 at 0:29

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