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  1. #1
    Junior Member
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    Question ATX power supply won't start

    Just purchased a new Gigabyte GA-MA78LMT-52 motherboard and a Gigabyte Superb 460W power supply and built a new computer. It operated well for about 3 days and then refused to start. Checked the switch and all connections but couldn't find anything wrong. The supplier then sent a test power supply and with this connected all worked well so sent the original PSU back to the supplier. I then get a message from the supplier saying on fault could be found with the PSU and it was returned to me. However, when again connected up it still refused to start. Where to from here?

  2. #2
    Senior Member
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    Default Re: ATX power supply won't start

    Send it back to the supplier.
    Intermittent fault.
    Did you tell them it works with the new power but not the original one ??

  3. #3
    Computer Technician wainuitech's Avatar
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    Default Re: ATX power supply won't start

    One of three things come to mind right away.

    Got another PC that you can plug the "faulty" PSU into and see if it works - downside to this is if it is faulty, it may cause problems with that PC as well.( a gamble it may blow something)

    Second - take the Compete PC to where it was purchased, you may find that the fault is actually not the PSU, but some other component Eg: motherboard, and the original PSU when combined with that board is causing a problem. This of course may be a problem if components were purchased from different suppliers.
    Could be an intermittent fault as well -- Does happen.

    Three - When you say it refuses to start - is it completely dead, no signs of any power, no LED's alight, or do the fans run ?
    Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth.

  4. #4
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    Default Re: ATX power supply won't start

    Quote Originally Posted by sroby View Post
    Send it back to the supplier.
    Intermittent fault.
    Did you tell them it works with the new power but not the original one ??
    Thanks, yes fully explained the position

  5. #5
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    Default Re: ATX power supply won't start

    Quote Originally Posted by wainuitech View Post
    One of three things come to mind right away.

    Got another PC that you can plug the "faulty" PSU into and see if it works - downside to this is if it is faulty, it may cause problems with that PC as well.( a gamble it may blow something)

    Second - take the Compete PC to where it was purchased, you may find that the fault is actually not the PSU, but some other component Eg: motherboard, and the original PSU when combined with that board is causing a problem. This of course may be a problem if components were purchased from different suppliers.
    Could be an intermittent fault as well -- Does happen.

    Three - When you say it refuses to start - is it completely dead, no signs of any power, no LED's alight, or do the fans run ?
    Thanks for your thoughts. As for trying in another PC the only ones on hand have 20 pin mob plugs which is unfortunate.

    Purchased both from the same supplier so might do what you suggest as it is starting to look like a fault with the particular combination of mob and psu.

    There is no sign of life at attempted start up. No fan or lights.

  6. #6
    Computer "Specialist" Agent_24's Avatar
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    Default Re: ATX power supply won't start

    Take the PSU out of the computer and try to start it manually.

    Short out the green wire to one of the black ones, if it still refuses to start then for sure it has issues.
    Non-system disk or disk error. Replace and strike any key when ready.

  7. #7
    amateur expert dugimodo's Avatar
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    Default Re: ATX power supply won't start

    The psu shoud plug into a 20 pin motherboard no problem, the extra 4 pins are usually detachable for just this reason.

    I hate faults that dissappear when returned to the supplier
    The ITX game machine; Bitfenix prodigy, 550W PSU, i7 3770, 8Gb RAM, 256Gb SSD, R9 290

  8. #8
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    Default Re: ATX power supply won't start

    Thanks for all the comments. Eventually fitted a replacement motherboard (supplier provided) but still PSU problems. Finally changed the PSU for another brand (again with the help of the supplier) and have had no problems since. A big thank you goes to Ascent Technologies for their support during this sort out.

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