Hey guys, Lots of threads about the dual processor upgrade but none about the single! I have bought myself a X5690 6-core processor cheap, and have chucked it in my 2009 Mac Pro but seem to have a hit a wall. I have managed to get it down to a solid white LED on the front without booting, and a red light on the tray when the heatsink is too loose. I have tightened and loosened the screws til I'm blue in the face but am wondering if its something else, could it possibly be anything else? Can my Mac Pro even run that processor? I'm worried I've bought something that my computer can not even run! Any advice would be greatly appreciated. Thank you!