Computer Won't Power Up!

A

Asmegin

New Member
So today I built a computer for my sister:

Antec Sonata III
Intel Core2Duo E6750
Gigabyte DS3 (Rev 3.3)
Geforce 8800 320mb

Everything went fine. Tested it for 3-4 hours. Played FEAR a bit. Temperatures were all looking good. I finished for the night and left her to it.

10 minutes later she says she was installing UT2004 and it just shut off. No weird noises or anything...just shut off.

Now it won't start at all. No lights, no PSU/CPU fan etc....

I've checked over all the connections and everything looks good. Did the obvious stuff (different cables, different outlets, checked power jumper etc) but to no avail. Peripherals plugged into the computer via USB DO get power (particularly the wireless keyboard/mouse dock).

Am I missing something simple? I'm leaning towards doing a tear down/rebuild but I don't really want to take to take it that far yet.
 
or did your CPU go haywire ?
if USB pheripherals get power it means that some else got burned, its definately not the power supply
 
what do you mean by now it does not power up? does the PS have a voltage switch? if so, flick it back and forth a few times, then set it back to 110 volts before trying to power back up and let us know whats up...
 
Okay I tried to short out the PW switch with a screwdriver...nothing..

If it was the CPU, wouldn't the power supply still power-up? How can I test if it's the CPU?
 
I mean that nothing happens. Not a beep, not a light, not a sound, not a fan etc.

Also there is no Voltage switch on the back...I think this power supply automatically detects it.

Interesting note, when I press the power button the wireless mouse/keyboard dock goes off for a second....
 
Okay I grounded the green wire of the ATX connector to the black and the PSU started up.

So it's the motherboard?!
 
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