Yes I got into windows and everything seems to work just like before I tried upgrading processors. What do you mean "re-seating"? just unplug them and plug them back in?
Yes, sometimes the connection isn't as firm as it needs to be.
Since you got into Windows, it does seem to me that you got a defective CPU. If re-seating the power cables doesn't help and no one else here has a solution, I'd say return/RMA it.