After replacing the motherboard my drive will not fully boot up. I get to pick a user but the system re-boots even in safe mode. I do not think the mobo has anything to do with the problem since my spare C: was set up on the old mobo. I put in a spare C: and I can view and access the old C: so the partition must be OK I am running chkdsk /r right now. It did have at least one error. I replaced the boot sector but none of these things helped. Any suggestions?