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Dell Optiplex GX620 PC is failing to power up

\015 I have a Dell Optiplex GX620 PC that is failing to power up. The umber light on the system board is lighting, showing that the board is receiving power. I tried to test the power supply in another machine and it is working properly. One test that I failed to do is to power up the machine through bridging the power pins on the system board because my computer uses the IDE cable to connect the power switch to the motherboard,and that makes me unable to locate the power pins on the front pannel Connector on the motherboard. I have also tried to power up the PC without other devices like CD ROM drive, hard disk and other PCI Cards but still no power. How can I resolve this?\015

Answers :

You may have a failed motherboard then. Failure of motherboards is usually due to breaking capacitors. A few years ago a capacitor company stole the "recipe" for making capacitors from another company and tried to make their own, unfortunately they did not get the ingredients right and the capacitors started breaking after 2-3 years of use. They sold these capacitors at very cheap prices and a lot of computer companies and power supply makers bought them. This is easy to diagnose. Look for capacitors (caps) (they look like little tiny soda cans) on your motherboard (mobo). They should be perfectly flat on top and not bulged or swelling or leaking anything. Make sure you look at all of them, on DELL's especially look under the cooling fan shroud as well. The dead giveaway is the fact that you are not getting anything after you changed the PSU. There are a few companies that will repair broken capacitor issues. Also if you add a bunch of extra components without upgrading the power supply you can suffer underpowered situations and that can cause internal parts to fail.
\015\012To eliminate some other stuff you could remove the memory and disconnect all the power plugs from the drives and then try to start it up. If it does not change the behavior at all (no beeps, no change in flashing lights) then you probably have motherboard issues. Make sure when disconnecting the memory chips (sticks) that you touch the metal on the inside of the case first to discharge static electricity. If it does change the behavior add 1 component or item back at a time to see what you can find out. Post back with what you find. And remember a bad PSU does not mean no power, just not enough to run the computer. Is the PSU that you replaced the same or greater output watts?
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