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I have a short somewhere in my desktop that is taking out my PSU's. The last time I moved some wires just a little bit and it went out. I need to know how to locate the short so I can rebuild the system with no more problems. I am not going to do any trial and error type troubleshooting since I am losing PSU's each time.

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  • seth veloso Jul 19, 2009

    thanks for the response and sound advise, I traced the problem to a bad mobo, if i unplugged the psu and plugged it back it, it would work again. The first one is shot I can hear it.
    seth


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Check the offsets between your motherboard & case. Make sure no part of your motherboard is touching the case. An offset may have vibrated loose. Also check the washers around your motherboard mounting screws to see if one has cracked or broken. Check your psu cables as well as all other cabling to make sure none is cracked or frayed. Last but not least check the exposed pins on your mb to see if any are bent over or broken & maybe touching. This is time consuming but it beats repacing a psu everytime you use the system. Hope this helps.

Posted on Jul 19, 2009

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Thank You For Posting

The "fan twitch" you're seeing is a nearly certain proof there is a short circuit somewhere. It could be the PSU, it could the the motherboard, or anything directly connected to either or both of them.

You need to reduce your machine to PSU + motherboard (out of the case/on the table) + CPU (with heatsink of course) + one stick of RAM + video card (if there is no integrated graphics). Reset CMOS, re-seat your CPU, cleaning the old and applying a new coat of thermal paste as needed, re-seat RAM and a video card if needed, then try turning the machine on. You can use a screwdriver head to short the power-on pins on the front panel pinout of the motherboard, if it doesn't have a dedicated power-on button on it.

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