Computer will not turn on, light only

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I was on my computer when the screen went white, computer would not restart unless I unplugged it from the power supply. It came back on but then a few minutes later it went black and it has not came back on since. The light comes on in the front but that is it. I took the side of and when i try to turn it on the fan in the back jumps a little and a led comes on. I don't know much but I am mad it quit working. It is less than 2 yrs old Gateway Gt 5012 Media Center. Please HELP!!!
 
First try would be to test the PSU (fan in the back thingy where you plug the mains cable in). Do NOT try taking it apart. Ever. You can check it with either a proper tester or by fitting another PSU on a temp basis.
 
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