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Random restarts could be cause by heat or software probs. Check the temps and also go into the system properties/advance/startup and recovery, click on the settings button and under system failure untick "automatically restart" and then get back to us with the temps (room, system and CPU under full load) plus the full error code from the next blue screen. You could always check out the Event viewer (control panel/admin tools) and see what red flagged errors are logged there under system and applications. 