Posted 04 August 2007 - 07:56 PM
With the case open you will notice that there is a board that all of you external devices connect to at the back of the case. This is the motherboard, and depending on the make and model there should be a fan sitting on a heat sink which is attached to the PCU, if this is not running the CPU will quickly overheat and will shut the system down.
Some models don't have a fan and depend on a large passive heat sink with a plenum to draw air over it, if the grill at the front of the case is impeded by dust and other material this could cause the CPU to overheat and shut down.
Until you provide us with the make and model of your computer we won't know what type of system you have and will not be able to address your specific problem.
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