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Computer randomly shuts down

Last Modified: 2012-06-27
Hi my computer keeps shutting down randomly, i have tested the memory, hard drive, PSU everything and still cant put my finger on why it keeps doing this.  I would just be running a virus scan using symantec or on the internet or just typing word documents and it would shut down, i'm not doing anything specific that is causing the problem.  I got a new PSU and new heatsink thinking these were the problems and has failed to solve the problem, please can someone help?
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