OK remounted cpu.
I noticed having the 4 pins at the end of the motherboard power connector on improperly, but fixing that didn't give me any better response.
Also I fixed the possible problem with the heat sink fan's motherboard mount.
Since I'm not seeing any way to tell which is the problem, do I send both back?
Probably the best option although the vendor will most likely only replace the faulty one. Alternatively if you know somebody nearby who has a spare motherboard that can take your CPU, you could verify with them first.