Question about Dell Dimension 5100 (D51L1) PC Desktop

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Dell dimension power supply / motherboard

We had a power outage today and even with a good surge protector my PC now will not start. The green LED is on when the unit is pluged in but it will not fire up. I have 5volts on 2 wires going to motherboard, I have no power at the on/off button on the front of the PC. Question is: How do I know if my power supply is bad or the motherboard? Can anyone help? Comment by kristech, posted on Sep 13, 2008 I have had the power supply in and out of the machine several times, I have reseated all possible connection cables and still nothing.

Just trying to figure out which part is faulty without taking the whole thing into the shop.

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  • Anonymous Sep 23, 2008

    I pulled the supply, plugged in 115V, shorted PSON to GND in the ATX
    connector. The fan turned on and all supply voltages checked ok.



    I plan to strap PSON to GND and put the supply back in the PC and see if it runs. Maybe the switch is bad.



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You can pick up a P/S checker for about 20 bucks all over the net. we used to have to use an oscilloscope to check it for spikes and such....

Posted on Sep 17, 2008

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I recently had a power outage for about an hour. My desktop was protected by a surge protector. After the power came on, my computer won't power up and there's no power light. However, there is a blinking...


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-replex

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you may consider reseating the P1 and P2 cables (from the power supply) connected to the motherboard.


you can go to www.support.dell.com and enter the service tag of your dell system (found at the back of your system) and look for the manual on how to add/remove the parts of the computer.

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