I have build a system for my dad. But it is acting strangely. When it boots it gives a bsod after loading windows immediately. Sometimes it doesn't even post.. I tries switching ram and it worked perfect for an hour or so so I decided to put back the orginal ram and that worked perfect too! But the next time I booted it, it was a bsod party all over again. Then I tried chkdsk C: /f and itworked for a while.. then it started all over again. Today it wouldn't even post so I swapped the gpu and it worked.. But again bsods all ovcer the place. Is this related to the hard drive (it's about ten years old and it rattles)? Or is it the motherboard?