is there any physical damage to the cpu? (pins bent, sratches, etc..) if not, i think you can apply for an rma thru amd, just tell them that youve had the problem since you have built it, just couldnt pin point the problem and have replaced everything but the cpu. that should apply you for an rma, if not, then just get a new cpu (which might just be easier if you have the money, but if your broke, rma is the way to go)