OK, so I am thinking, test the new CPU in another PC.
Actually, I would test each individual component in another PC, that you arent bothered about dying. If they all check out then test with combinations of two components from the ill PC.
Then if you still cant get things to work in your favour, I would sell the individual components, to other people, let no two of the components go to the same person. The go out and buy completely new components and try again, or go to a shop and get a custom one done, or buy a Dell, Compaq, IBM or whatever.
I really am sorry, I wish we could help out getting it sorted. You could also try taking it to a PC diagnostic place, they will have plenty of alternative components left over to get the thingn working, might cost you a bit, but once it is working, it will be worth it, if you do get it fixed, then let us know what was screwing it up, I think bye now we would all love to know what had us all so stumped.