I just helped a friend build a system. It worked fine for several days, including bioshock / guildwars, but then it crashed and windows wouldn't boot / had issues booting. Now the Windows Vista CD crashes too, I have Linux Isos and they don't work - what could be the problem? I've tried two different sets of memory, CPU temps are fine. The first set of memory failed memory tests until I set it to 667 instead of 800, but the second set works fine even in 800.
Edit: Reset the bios to default settings w/ second set of memory and works. One of the original sticks is bad. =/
Edit: Reset the bios to default settings w/ second set of memory and works. One of the original sticks is bad. =/