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I was using my computer when suddenly it shut down. It was assembled 7 months ago, while the PSU is two weeks old, though it is not a good brand. When I try to reboot it, a led on the case fan lights up for a split second and then turns off. Nothing else moves or seems working. I tried removing and connecting again the connectors to the motherboard, I tried to unplug it for a half minute, but nothing seems to work. Could it be the PSU?
I also tried to change the power cord, but nothing changed, red light on for a split second and no other sign of life. – Elena – 2012-12-19T23:12:12.427
if nothing has been added lately, I would unplug all external usb devices... mice/keyboard/camera/exthdd etc... and then try starting it. Then I would unplug any internal cdr/dvd or hds not needed to boot... even pci cards – Logman – 2012-12-19T23:35:55.930
1"it is not a good brand" "nothing seems to work" "Could it be the PSU?" Absolutely. This behavior is usually a power supply, or less likely the motherboard. (In theory lots of other components could cause shorts or grounds that would cause this behavior but it's really unlikely.) – Shinrai – 2012-12-19T23:40:19.257
It shouldn't be too hard to find someone else with a compatible PSU. Try that and you can rule your PSU in/out – Lee Taylor – 2012-12-20T00:23:45.983