I have a Dell Optiplex GX620 which is plugged into a power strip. Yesterday, I was moving furniture and I accidentally hit the power strip's switch. When I turned the power strip back on, I clicked the power button on my PC and nothing happened, no fan noise, no light, nothing. What is the problem and how do I fix it?

On the back of your PC there is a blue 15 pin video connection. Connect your monitor to this video connector, power up your monitor the boot up your PC.

Try hitting the F8 key or what ever is the key for safe mode, or try F11 for boot menu, if boot menu shows boot to hard drive.

If these don't work, unplug the PC, then hold the power button until the lights flash or hit again and make sure lights don't flash on.

remove the side cover, touch metal, then remove the little round battery for 5mins, replace, plug in, hit power, not hit the delete key and try to boot into the BIOS, you will need to set the date and time. then move to exit and save changes and exit.

That usually means the switch on the power supply has been moved to 220v vs 110v. The switch is located just above where the power cord plugs in.

How lazy, don't you have the Google to use?

Figured that was the problem. Nice work

It sounds like a power management issue. Click Start > Run and type control panel. Hit enter and find the power management section. There should be an option to select how long it takes for the system to "sleep." You can disable this option, so the system won't sleep. I've included a brief how-to on the matter.
http://www.wikihow.com/Disable-Automatic-Sleep-on-Windows-or-Mac
Thank you for using FixYa!

Check the capacitors on the motherboard, Dell had a BIG problem with faulty capacitors on the GX270, GX520, GX620, GX745 and GX755 units. The parts would cause the unit to either not boot at all or lockup booting or running programs. I would bet you have some that are just beginning to fail and the motherboard power is not stable which would mean the chips are not getting enough power. Here is a link to an article about the issue and what to look for on your board.

http://www.ccl-la.com/blog/index.php/dell-optiplex-gx620-motherboard-repair/

I hope this helps you out, if so please rate my solution.

BuddyMc

yes take it up to the place u bought form and say yall broke my stuff

what wass the last thing you were doing before this happened

sounds like the motherboard got cooked, too