Hi guys. Trying to decifer wich part of my old mac pro 1.1 is at fault. (2x2.66/GT7300/SSD/20GB) for not being able to load any OS Have pushed the DIAG'nose button on the pcb, and got the following LED-feedback, where the four LEDs in CPU A&B not turn on). (attached picture) Can i take that "info" as a valid-indication that its the CPU at fault? I do get the chime, and the boot up choices, with OSX or windows, but when choosing OSX I just get the timewheel spinng for some time and then white blank screen, with an secondary black cursor at top left at times, and other times just blank white. when choosing Windows, it just goes black with an screen message stating "signal out of range" Have tryed SMC reset and change battery/PRAMwithout any change- My mac pro1.1 went belly up for one moment to the other, so Im a little unsure if its thruely the CPUs that are at fault, and would have reckon it was the GPU GT7300. anyway to decifer that its thruely the CPUs that are the sinner, before jumping on a new pair of X5355, in regards to if its the old 5150 dual core CPUs that are messing my beloved computer up.. thx for any help, its certainly highly appreciated, Im on a pron-level when it comes to trouble-shoot my old mac where my insight is relative..