Solid orange light on motherboard when power light is plugged in

Nana, A solid amber power button on your GX520, indicates a motherboard failure. The motherboard will need replaced. Check the attached links,instruction and guides, Good luck
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Solid orange power button on Optiplex GX520
My Dell Optiplex GX520 will not boot Forums
Dell Optiplex GX520 amber solid light no power

Orange light means motherboard is not responding. Check your motherboard for faults please.

before replacing main board,try replacing individual hardwares like ram,processor and if still not working,try resetting the bios by alternating the jumper on the labelled CLR CMOS

good luck

Hi, It most likely is a faulty power supply or a motherboard issue. Remove the power cord then press and hold the power button for at least 30 seconds. Then plug it back in and hit the power button. This will release any static buildup that might be in the computer and sometimes that causes it not to boot. If nothing is happening it is more likely your power supply than the motherboard.

Hello,
The orange blinking on your desktop power button says that there's a problem with either the power supply or the motherboard itself.
Please refer to this link for the diagnostic lights on dell computers.
What you can do is: 1. unplug the power cord 2. press the power button, hold on it for more than 5 secs 3. re-plug the power cord on your CPU 4. test if it the system will work.
If this troubleshooting step does not help, that means it is more likely that the problem is with the motherboard.
Hope this helps!

HI disconnect the ac power wait then connect again if problem exist open the front door and close

try this ,unplug power cord turn off computer, (if you have switch) there should be no electricity. Remove little battery that you have on your board,wait for 10 sec. and pull it back in, that will restart cmos to default values.PLug power cord, turn on computer. Post me what happened.

its going to rather your power supply or your motherboard has died, id try a different power supply first

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.