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Please help PC shutting off randomly

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April 3, 2009 8:20:28 PM

I have a custom built computer made for gaming that i built with my dad during christmas time. Everything has been runnin perfectly up until today. I got up and turned my computer on went downstairs came back up 1 minute later and it was off. I tried turning it off again and nothing happend. Then i tried again all the lights turned on for a second then it turned off. I flipped the power supply switch off then on then turned it on again. I was playing Call of Duty World at War for about an hour and everything seemed to be going good. I then went on Call of duty United Offensive when about 15 minutes into playing the computer just shut off for no reason. I booted it up again and again after about 15-20 minutes it happend again.

Please help me with this problem.

Intel Core 2 Duo 3.00ghz
Asus motherboard
4 gb ddr2 800mghz
Windows XP
Nvidia geforce 8800gt XXX
250gb hdd
Apevia Xplorer case
650 W PSU
Cooler Master Hyper Cooler cpu cooler with 4 copper heat pipes

More about : shutting randomly

a b ) Power supply
April 3, 2009 9:20:13 PM

Have you checked the cpu temp? Download speedfan, it'll give a good reading.
April 3, 2009 9:22:50 PM

First I would unplug everything except your Power Supply (if it spins it should work). I had a similar issue and my Power Supply was bad it just booted once, then after some time would not boot, then I booted again after some time went by and it randomly shut off. My Power Supply was DoA so i RMA'd to get a new one and after that it has been perfectly fine.

Another thing I can suggest is check your MB temp and your Graphics temp and see if it gets to a certain temp and overheats etc.

Last thing I would do is run a Memtest for your RAM see if everything is ok. I had random blue screens on my vista machine after a certain amount of time which randomlyl caused it to shut down. My RAM (Crucial RAM) was ok, but I still crashed I then decided to try a different brand of RAM G.Skill booted up just fine, and never got any more blue screens/random crashes since then.
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April 3, 2009 9:50:12 PM

Take the side cover off and check for dust build up esp. @ fans and heat sinks.
April 3, 2009 11:53:34 PM

I just blew out a lot of dust on the fan so i will see if that helps. I will keep you guys posted to see if it keeps happening. I will download the speedfan to see how that is.

Thanks a lot for your help!
!