If not, buy a can of compressed air at your computer store, take off the cover from the computer, then blow the dust from around the processor, the heat sink, the power supply and all fans and vents.
Hope this helps.
My computer fequently will just shut down and reboot for no reason. I don't get any error message on reboot. It happens when different applications are running. Sometime just the application will suddenly close down, and sometimes the whole system will just shut down and reboot. It can happen within 5 minutes of starting, or after several hours when the CPU has heated up. I've updated all the drivers. Can anyone give me any suggestions?