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    can any one tell me how to test psu is working correctly or not?

    i brought multimeter and other stuff from my service engineer.
    also suggest me some thing which i can do with my problem, cpu not starting.
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    The easiest way is to try another psu, as we have said. If you have a multimeter and know how to use it, you can check the voltages on each rail and see if they are steady and up to spec. Really though, borrow a psu from a friend or something, its the quick and easy way to check.
    --Dave--

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    Black is negative, most PSUs use a common ground, so you can leave the negative lead plugged into black wire on an open molex plug.

    Red is +5vdc, yellow is +12vdc

    I can't recall which colors are -5v and 3.3v off the top of my head, but that's what Google is for.

    Your tolerance for the positive voltage levels is +/- 5%, 10% for teh -5vdc.
    Asker of questions and all-around annoying guy.



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    My cousin had the same problem as you're having right now.
    I gave him little tips like: Try removing the dust out of your machine, that might work.
    So he did, removed the dust, and his PC worked fine again.
    You should remove any dust on your cooling fans and in your power supply.
    Dust is an enemy for most PCs
    I hope it works again after you've cleaned it out, good luck.
    And after all, it's a lot cheaper then buying a new mobo or power supply.
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    thanks to all for helping me


    thanks to all for helping me

    my problem solved. i replaced my 350 watts psu with 400 watts new psu. my system is working fine. graphics card also working fine.

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