Thanks for your reply! The cpu is a Core i7-860s.
I wouldn't think that the psu would've had to be much bigger.
It's definitely a LGA 1156, and it's definitely in correctly.
Thanks for clearing that up
Doing some research on your PSU, it might be the cause of your troubles...since it's really a..erm (For a lack of a better term) POS.
I highly doubt it's a CPU issue since they very rarely die. Even more rare for them to be DOA.
As I'm only 90% sure of my theory, it would be nice if someone could pitch in