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To do so, put your ear to the case of the CPU. If you hear a humming noise, it almost certainly indicates that the fan is running. If, for some reason, the fan is not running, your CPU will overheat and the computer will refuse to turn on until the CPU cools down.If you smell acrid smoke, some component of your computer (mostly your motherboard) might have burnt out.It will need to be replaced.f, for some reason, the fan is not running, your CPU will overheat and the computer will refuse to turn on until the CPU cools down. If you smell acrid smoke, some component of your computer (mostly your motherboard) might have burnt out. It will need to be replaced.
I have a Dell 8400 which I just did a clean install with Win 7. During the day, the unit will come out of power save mode fine, but in the morning the fan is still running and the computer will not come back up. If you push on the power button it will flash an image on the monitor and then shut off.