Sounds like overheating.... Take the cover off, then start the computer to make sure the fan over the cpu is running also make sure the fan in the back of the computer in the power supply is running. If it's running then shut it down, get some compressed air from RadioShack ( Has No Water In It ) and Blow all the dust off the cooling fan and heatsink under the fan. Blow the dust out of the power supply. Your coputer should run like new....
Hope this helps..
Have A Nice Day.....
When a system shuts off after about the same amount of time every time--and it can't be traced to having one particular program, it usually means it's shut down because it's getting too hot. Do you get any warnings? Can depend on chipset/settings what alerts you get. Something often overlooked is the cpu fan, if your system is a couple years old, that'd be a generally cheap/easy replacement that often fixes it. It can be very hard to tell just by looking at it if it's working normally or not. Any noise?
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