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New build. Question: MBO or powersupply dead?

Hello,
I just installed a new MBO MSi A75A -G35 and installed new power supply, and plugged in power connection to MBO. Nothing happens when I turn it on. I performed the paperclip test on the power supply and the fan turned which it did not do when plugged into the MBO. However, I have no lights anywhere that are lit. Question: how do you know if it is the power supply or motherboard which is the problem?

I don't know if I am in the correct forum so if I need to be moved please do so.

Thanks.
12 answers Last reply Best Answer
More about build question powersupply dead
  1. Hi, have you connected both 24 and 4-pin power connectors? Are the case reset and power switches correctly connected to the board's header?
  2. alexoiu said:
    Hi, have you connected both 24 and 4-pin power connectors? Are the case reset and power switches correctly connected to the board's header?


    No, I guess not. My power supply came with a 24 pin connector but not a 4 pin connector in the configuration that the MBO has listed. I do not have a 4 pin connector from the power supply in the orientation that is listed on the MBO diagram. I "assumed" that the 24 pin connector was the only power supply connection needed to the MBO. Is there supposed to be a 4 pin connector as well as the 24 piece power supply connector?

    Thanks for your help.
  3. There may be an 8 pin ATX connector on your PSU (possibly a 4+4 pin - NOT the 6+2 or 8pin that says PCIe!), if there is an 8 pin ATX you can use it on the 4 pin ATX on your motherboard, it'll just hang over nothingness a little
  4. fireflyva said:
    No, I guess not. My power supply came with a 24 pin connector but not a 4 pin connector in the configuration that the MBO has listed. I do not have a 4 pin connector from the power supply in the orientation that is listed on the MBO diagram. I "assumed" that the 24 pin connector was the only power supply connection needed to the MBO. Is there supposed to be a 4 pin connector as well as the 24 piece power supply connector?

    Thanks for your help.


    Yes, it is, otherwise the CPU doesn't work. I assume that the CPU fan does not spin. What's the model of the power supply?
  5. You are correct, the CPU doesn't work and the fan does not spin. Here is the link to the power supply:

    http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=899123&CatId=1079

    Thanks for your help. This is a bit overwhelming.
  6. The PSU has a 8-pin and a 4+4 pin power connectors. Connect one of the 4+4 pin to the board's EATX connector.
    http://www.playtool.com/pages/psuconnectors/connectors.html#eps4plus4
  7. The PSU has a 8-pin and a 4+4 pin power connectors. Connect one of the 4+4 pin to the board's EATX connector.
    http://www.playtool.com/pages/psuconnectors/connectors.html#eps4plus4[/quotem

    Sorry for this question - it is probably stupid question, but does the 4+4 pin layout lookout like a retangular 8 pin plug? If so, I guess 4 pins just are not connected? Sorry for this obvious question but I am a bit of a newbie....
  8. You are correct, the CPU doesn't work and the fan does not spin. Here is the link to the power supply:

    http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=899123&CatId=1079

    Thanks for your help. This is a bit overwhelming.
  9. Best answer
    Anonymous said:
    The PSU has a 8-pin and a 4+4 pin power connectors. Connect one of the 4+4 pin to the board's EATX connector.
    http://www.playtool.com/pages/psuconnectors/connectors.html#eps4plus4[/quotem

    Sorry for this question - it is probably stupid question, but does the 4+4 pin layout lookout like a retangular 8 pin plug? If so, I guess 4 pins just are not connected? Sorry for this obvious question but I am a bit of a newbie....


    Yes, they can be connected together or separately. Plug one of the 2 connectors. Pay attention at the shape of the pins (round and squarred) so that the position matches the motherboard's connector.
  10. OK - thanks so much. I will be able to try this tonight when I get home from work. I'll let you know how it goes. Thanks again for the help.
  11. Best answer selected by fireflyva.
  12. alexoiu said:
    Yes, they can be connected together or separately. Plug one of the 2 connectors. Pay attention at the shape of the pins (round and squarred) so that the position matches the motherboard's connector.


    Alexoiu -

    Thank for the information. It worked just as you said. I also found a few other problems along the way I was able to repair but your advice took care of the problem. It is up and running well now. Thanks again.
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