A bad stick would cut to a BSOD and then reboot, instead of simply shutting the system down.
It could make it hang on the BSOD and force a hard reboot. (Not "fighting" by the way) What would really help would be the BSOD error message and codes it gives, but mostly the error code. Write it down or take a picture with your phone and post it or a link to it or google it.
-- Fri Aug 20, 2010 12:00 am --
Specs would help, and brand if not self built.