Ok so i used to have a Pentium D 820 w/ intel mobo. I went out and got a amd 64 3500+. w/ mobo. so i pull everything out of the first system to the new one. Now here is what happens. boots up fine and stuff but when it gets to the windows loading screen, it reboots. so uh, i made 2 partitions on the drive for a back up os. ok so i boot up the back up os and get a blue screen. so i'm like wtf you knowwwwwwww. so nowwwwww i'm like ok, maybe the OS is corrupt. put in windows, do a windows repair, yada yada, ok again windows loading screen, finishes loading and reboots. SO i said the HD is bad, go get a brand new one. same thing. OK! took out processor, put it on again with paste. turn on... same thing! oh man. i think the mobo is bad guys! oh yeah, i tried at least 4 differents sticks of memory too.