Question about Dell Dimension 5100 (D51L1) PC Desktop

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My Dell Dimension 5100 computer fails to start when pressing the on/start button. There are no lights illuminated/blinking at the on switch. After considerable troubleshooting I discovered I can start the system by momentarily grounding the green wire (power supply start) on the 24 pin power supply connector and then pressing the start switch. Does this mean the startup logic circuit on the motherboard has failed and the motherboard must be replaced?

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  • rgh1016 Aug 22, 2010

    It appears there is a logic circuit between where the on switch ground comes into the motherboard (Connolly E 187242 F2) and where it applies a soft start start ground signal to the the green wire on the 24 pin power supply connector and this logic circuit is powered by the battery on the motherboard.



    When I removed the battery, cleaned it, and re-installed it, the computer powered up correctly. I powered down, removed the power cable, reinstalled it after the green light on the motherboard was extinguished, then used the on switch to start the computer and it powered up normally. I did this numerous times to just make sure it wasn't a momentary fluke.

  • rgh1016 Aug 23, 2010

    The following supplements the original problem description:
    If I let the Windows power down and shutoff the computer in a normal manner and don't remove the power to the computer, I can start the computer by pressing the power-on button on the front of the computer. However, if I remove the power to the power supply after the machine has been powered down, I can only re-start it by momentarily grounding the soft power line on the 24 pin power connector. Replacing the battery did not have any effect.


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Posted on Jan 02, 2017

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SOURCE: Computer fails to start

I'm reasonably sure that it is a bulging or bad capacitor issue. We have had Dell replace a large number of motherboards on SX270 and GX270 computers, due to underpowered or counterfeit capacitors on a large batch purchased back in 2005. The capacitors swell or burst until the computer will not turn on anymore. You'll get the amber light inside the unit, plus a green light on the power supply, but the computer will not power up. You can try the solder technique, but you'd be better off replacing the system board, if possible. Happy trails!

rgmckenz

Posted on Nov 28, 2007

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SOURCE: Dell optiplex won't Boot-up.. Orange light on motherboard

its going to rather your power supply or your motherboard has died, id try a different power supply first

Posted on Aug 11, 2008

APremkumar
  • 564 Answers

SOURCE: Dell Dimension 5100 No Power No lights

Hi Eric,
Don't Worry we can fix this this problem.
This seems to be no power issue.
Just mail your email address and number to apremkuma@gmail.com
Thanks, Prem

Posted on Mar 08, 2009

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SOURCE: connecting front panel leads of generic case to 4600 motherboard

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Posted on Mar 20, 2009

ajx13
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SOURCE: Dell dimension 2400 blinking amber light

1. Remove All External Devices
2. Check the Computer's Power LED
3. If the power LED has not changed unplug the Power Cable From the Computer Disconnect All Hard Drive Power and Data Cables and power on the computer. If still no go.
4. Remove All PCI, PCI-E, and AGP Expansion Cards .
5. Remove All Memory From the Computer
6. Reseat the ATX and 12-Volt Connections . The ATX connector will be a 4 pin square connector connecting to the motherboard from the power supply and the 12-Volt Connection would be the biggest connector with a lot of colored wires.
7. If still no go.
8. Disconnect the Power Connection to the Chassis Fan
9. If the light still flashes then it could be a power supply or motherboard failure. Try a good know power supply first and if that does not fix the problem it is the motherboard. Also check the back of the tower for 4 lights lables ABCD or 1234.
Rate if useful.

Posted on Aug 11, 2009

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