71 Celcius! OMG, serious cooling issues and most certainly the cause of you're problems. You need to open the case and throw a 20" inch box fan on that thing, LOL. Seriously, time for a HSF reseat and some case fans............or more/better replacements.
What a mess...........What motherboard? There's so many things to try, I don't know where to begin, but first I highly doubt a hard drive is causing BSOD's. Usually memory(along with bad BIOS settings), heat(the 1.4 Tbird was one of the hottest running AMD's) or a bad power supply are the most...