My Optiplex 360 receives power on board but does not power up.


The machine receives power on board but does not power up, tested my PSU and its fine, my Ram is ok, tried a different switch and its ok. So far that's what i have tried doing but with no success...What else could be the cause for this?

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.
To 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?

I have the same issue, in my case, in some Dell's I get a loud FAN noise as well, so far except for the FAN issue replacing the PSU had no effect so I think it is the MB/Proccessor. Recently dusting out the Processor worked on one of the mis-hap Dells which has thuis issue. I personally think Dell tech's should look into this and post some working base solutions!

HELLO THERE:
THE FIRST THING YOU WILL NEED TO DO IS TO DOUBLE CHECK ALL THE CABLES AND POWER CORDS ARE FIRMLY INSTALLED NORMALLY REMOVE AND REINSTALL THE CORDS AND CABLES TO MAKE SURE THEY DID NOT COME LOOSE IF IT WONT BOOT THAN TRY TO REMOVE THE CD ROM AND THE HARDDRIVE CORDS AND CABLES FROM THE DEVICES AND TRY TO BOOT IF THE MACHINE IS NOW STARTING INSTALL THE CABLE AND CORDS 1 AT A TIME FOR EACH DEVICE AND BOOT UP THE MACHINE EACH TIME THIS WILL HELP YOU FIND OUT WHERE YOUR PROBLEM IS OK.
BEST REGARDS MIKE

Dell Optiplex GX620 has a failure power supply. A some of the capacitors inside it are poor quality :( .In this case is an emergency procedure to start power supply (ie. for backup) : make a temporary shortcut between green and black wire in main mo-bo connector (24 wires) , and use normal Power On button. When main fan starts remove temporary shortcut.

CMOS battery, that's a easy fix and cheap. Is the HDD spinning up, LED'S blinking? Bad HDD, remove and test.

Hard drives can exhibit extraordinary heat output as the platter bushings start to go bad. Sometime they will make noise, but not always. As the platter bushing wear out the drive system draws more amperage from the power supply. This can cause both the HDD and the power supply to generate exesive heat. Unfortunately, there is no definate test for this. If you have a spare drive, you can run it for a couple of hours to test this theory. Best bet is to get that data backed up before you loose the drive all together.


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