Question : Problem: System shuts down after attempt to start up

I can get into bios alright and system will stay up, but if I try to start up system into Win XP, it will go through post them ask me how i want to start it up in, i.e. last known, normal, ect.  and then it starts to load but shortly after the start it shuts down.  Now, the system had probably overheated as the cpu fan was shot, so i got a new heatsink and fan and cpu, installed all, and now I have this problem.  Any help will be greatly appreciated.

Answer : Problem: System shuts down after attempt to start up

can you run this?

www.memtest.org

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