Hi all As the title describes my mac Pro wont boot after changing the processors. It is a 4,1 EFI flashed to 5,1 14 gb ram in 7 modules. Standard grafics card. Booting from a 128 gb ssd in slot 1. Standard cpus is two quad core 2,26 GHz New cpus is two hex core 3,33 GHz x5680. After changing to the lidless x5680, it wont boot. I have tried to reseat both cpu several times, only Change is that sometime the fans spin at max rpm, others Very slow/not at all (Dont know) I have tried to remove everything, ram, optical drive and the entire cpu tray. When it is on and i Press the diagnostic button the 5V STBY led is orange? Both cpu leds are OFF. The original cpus are tighten all the way Down until the screws cant go any further. I do the same thing to the x5680. When i Mount the original cpus it starts as normal, with no problems. What am i missing? Hope you guys can help me, so i can get i working.