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Computer turns off while playing games

Last response: in Components
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My computer shuts off completely, no blue screen ect. Also it turns right back on no trouble at all. when I play WoW and once while I was streaming a online t.v. show. I recently replaced the fan and heatsink and it seems to be running cool between 40c and 60c Ive had a friend run a program to check my computer and I think it checked all the software and he checked out the hardware finding no problems. It still shuts off. Any ideas? I would really appreciate some advice. btw sorry if any of my terminology is off I dont know much about computers!

most likely a power supply issue, or possibly Ram.

Need to know:
Power Supply brand:
Power Supply model/wattage:
Processor:
Graphics Card/s:
Ram:
Motherboard or Computer Make/Model:
Year/Month Purchased:


Also, if it is a ram problem you cannot simply 'run a test' to check it. You have to run a memory specific test for several hours to see if memory is bad. Go download memtest 68+ and run it for at least 8 hours.

When a computer just plain turns off (no blue screen or reboot) then its usually a power issue. Most often an issue with the PSU, but a dying motherboard is also possible. I'd start by replacing the PSU (or borrowing one for a bit) to see if the problem goes away.

The 40c-60c temps, is that under load or idle? If thats idle temps you could be hitting a thermal limit in the bios. 60c idle is much too hot.
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