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Without tools or other spare components/computers, how to troubleshoot ''dead'' Dell Dimension 4500? No beeps/fan, etc. Have taken off front cover and switch seems okay mechanically. Small green light on mobo is on, but no other lights/sounds. Have removed RAM, all drives, and all cards except graphics adapter, and still nothing, no monitor signal. If you say it is the PSU, why? How do I know it isn't the mobo or CPU? Thanks for your kind help!

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Well, it's cheap enough to purchase a power supply tester and check the power supply first. This would be much cheaper and buying a power supply as opposed to a motherboard would be much cheaper. The power tester runs around 10 dollars at any hardware store. Usually if the power was working, you would at least see fans working and hard drive sound so that would be the first thing I checked is the power.

Posted on Sep 13, 2009

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With case open, and power ON...
locate the two "power" pins that were connected to the power button cable that is on the front cover.
Find them and tempoarily "short" them with a metal thingy, like a paperclip, taking care not to touch any other components. If it starts or produces a beeping code, then put it all back together and make sure the power pins are properly connected.

If it doesn't work, then perhaps the 12 volt side of the power supply is out. The mobo LED is powered by the 5 volt side of the PS.

The 12 Volt side powers heavy things, like the hard drive motor, fans, cd drives, etc.
the 5 volt side if for the data bus or circuits.

The power supply may have several "legs" of cables. If so, use only one set to see if the system works; then the other.

I hope this helps and it works!




Posted on Sep 13, 2009

  • Just Gort
    Just Gort Sep 13, 2009

    The two power pins are on the motherboard, by the way.

    You probably knew that, but I just wanted to clarify my "solution"...

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