Question about Compaq Evo D500 PC Desktop

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Coolmaster 500w power supply

I put the coolmaster 500w power supply in the compaq and nothing happens. Its as though there is not electricity getting to the motherboard.

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First check, using a voltmeter, to see if your power supply is working. Secondly, if it is, then reseat your boards and check all connections (internal and external) and try again. Lastly it could be as simple as the on switch is broken. By shorting the pins on the board where the on switch connects you can by pass this to determine if it is the switich. This should reveal your problem. Tango.

Posted on Feb 05, 2008

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It is more than likely the power supply that is faulty. Newer PSU's have a 5volt supply missing, this means that some older boards will not run with the new PSU's. Try and find an exact match for your older supply but with a better power rating, if that is what is required.

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Will the desktop even post? I would remove each component, one at a time, and try powering the pc up each time - i've seen issues w/ a processor/mobo being incompatible, causing the pc to not power up - also have seen issues where the power supply isn't strong enough to power the system...especially w/ the coolmaster cases. Do you have a 1000w supply to try to swap in the machine?

So, first pull the memory - try to get it to post - then h/d, etc.

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hi im josh in cebu phils.may i help you? Friend nothing happens to your motherboard or cannot completely open when the supply current is not enough to support or provide the mainboard.especially if there are many devices attached such as video cards dvd rm etc. you need more power to make them work. so you need to change or use a power supply having a output.500w up.for better good luck hope i helped you.vote so that i'll know if i did it so.

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Two sets of power leads to motherboard from pwr pk, 1 x 20 pin and a 4 pin, when the 4 pin isn't attached to the 8s651mp-rz motherboard the fans spin, the mother board light comes on, but then does...


The 4 pin connector is required as it provides the power for the CPU to run. if nothing is happening with the 4 pin connector plugged in then there is a problem. You need to make sure that you Power Supply can supply enough power for what you are connecting to it (400W would be the bare minimum with no high end video card, 500W would be recommended). You also need to make sure that the Power Supply is connected properly because some Power Supplies from pre-built systems from companies like Dell are wired differently than the standard power supplies. The only other likely problem is that there is a short on the motherboard either from the mounting of the motherboard in the case or from something on the motherboard being bad. Make sure there is no metal touching the motherboard except at the holes used for mounting.

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1 Answer

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I hope trouble with your motherboard as far as your power supply is new and giving the accurate voltage.

The motherboard is controlling the switching device. Some short circut may be happening

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A half volt will not make any difference. Sounds like the power supply is malfunctioning. Start by trying a different one. Keep in mind that you may have fried the new motherboard by using a faulty power supply. Popping sounds indicate a short or loose/exposed wires, and are never good with any electrical device, especially a laptop since they are sensitive to power fluctuations to begin with.

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The next time you get a PSU. Tell them what you have. Apparently you got one that is not compatible with your compaq.The power (500 wattage) will work with your MB.
Get an OEM PSU from Compaq(HP).

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Either the new power supply you purchased is not functioning correctly. But, assuming it is now that you are getting some form of power to your PC, it is very likely the motherboard. Whatever fried your old power supply (or it could have just been the power supply itself) most likely fried your motherboard in the process. Probably not the CPU since the MB can't even post.

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