Martin Karne on 29/12/2006 at 17:22

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By experience from friends and my own, those power supplies with no brand / no name, may cause sudden reboots or lockups.
Also caused by overheating, either the video card or the cpu.



EDIT
Also a lower powered supply might do this, consider increasing power supply capacity.
Example if you have a 430W PSU get a 550-600W or higher.