Question about Dell (58GGC) Motherboard

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No Power Up State

The computer is a Dell Dimension (300?). It uses the standard 24 pin supply. The computer will not power up. With the PSU disconnected or connected to the MB I can read approximately 5V on the Supply voltage pin and +3.85V on the Power On pin which I believe to be correct in the PSU off state. This computer uses a power switch/USB circuit card for power up. I have tested this card in another unit and it functioned normally. I measured +3.84V on input connector and across switch (switch open) as well as 0V (switch closed). The +5V supply was on in both states. In the unit in question the voltage across the power switch (switch open) is low at only +0.75V (even though the PSU input connector still measures 3.84). So I am dropping approximately 3V somewhere on the MB. This is the case whether the CPU is installed or removed. Where should I look for the voltage loss? Is there a component(s) sharing this signal line? Where on the MB does this Power On signal go...CPU...RAM...etc? Any help would be appreciated.

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Posted on Aug 21, 2007


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Amber light is flashing on my computer and it won't turn on at all. Help!

The Dell Dimension 300 gets the amber blinking light when there is power to the computer (the power supply) but the motherboard isn't getting the correct power. Sometimes it can indicate a motherboard fault or that the power supply is not set to the correct incoming voltage.

Check the back of the computer. If the power supply has a switch for incoming voltage, make sure that it matches your incoming voltage. Next check that the main power cable (20 or 24 pins depending on the computer) is fully seated on the motherboard. (It can only be connected one way and should lock onto the connector on the motherboard.)

Next check that the power supply is providing the correct power. You can simply install another power supply (known to work on another computer). Make sure that the PSU is correctly sized for the computer components. Alternatively use a multimeter or a dedicated power supply tester or put it in a different machine.

If the problem is not cured with a new PSU, the motherboard has a failure. Unfortunately, it's difficult to identify the exact bad component. (If a major component other than the CPU on the motherboard had failed, the diagnostic lights or beep codes could help identify the issue.)

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Replace the power supply.
MAKE SURE it is a compatible one!

What do I mean by that statement? In some years of Dell manufacturing, Dell made their computers "Proprietary".
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The wires in the 20/24-pin ATX main (Motherboard) power cable, were put in different socket holes, than a standard 20/24-pin main power cable.
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If you buy an aftermarket power supply, instead of a Dell unit, make SURE the colors of the wires are in the same place, as they are in the Dell 20/24-pin main power cable connector!

For more info about that last statement, I suggest you check out this page,

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Hope this help!
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