Hi, I wanted to upgrade my early 2009 Mac Pro 8 Core to a 12 Core with Firmware 5.1 upgrade. Like the guy on this thread i got almost the same Problem. http://www.anandtech.com/show/2800/upgrading-and-analyzing-apple-s-nehalem-mac-pro/11 after i changed the cpus i get a red light near the CPU A socket near dimm slots and a CPU A Temperature Overheat warning LED. after i remove the CPU_A heatsink i saw some bended pins hurray! So it looks like i killed the processor board. but what happend to cpus is it killed too or how can i know that its shorted or something. Has anyone some advice or experience with those problems?