I'm glad you found the board is working properly. As for the CPUs... I'd say you may need to work on your anti-static handling procedures. Static shock, even so small you can't feel it, can kill electronics without damaging the look of the device. It is very possible that you managed to shock the CPU as you took it out of the package or put it in the motherboard, or somewhere in between.
Make sure and either have a constant grounded connection when handing electronics through an anti-static strap, or, at the very least, touch bare metal that is grounded every few seconds while handing computer parts. I usually have a computer or power supply nearby that is plugged in to ground myself. It doesn't have to be on, but just plugged in. The casing of any power supply is grounded, and a case touching it metal to metal is therefore also grounded. (Cases painted internally are not properly grounded, so don't count those.) Most importantly, though, keep any computer components in anti-static bags or containers as long as they are not installed. Don't leave parts laying around out in the open if you plan on using them later.