Hi all this should get you juices flowing! I have an ageing 5,1 Mac Pro which has a dual processor tray. When one processor is fitted all is fine if a bit noisy with fans and stuff. The problem arises when I fit the second processor. The machine refuses to boot unless I freeze the tray in the freezer for an hour before installing it in the Mac.
At this point it boots fine until processor B starts to warm up (couple minutes) at which point I get a temperature warning light and the machine dies.
After much investigation I have identified the offending device on the tray's circuit board as an F2117TE20H microcontroller which functions as a secondary SMC to the primary SMC on the main motherboard. It seems this is either getting bad temperature data from processor B for some reason, or is misinterpreting it and flagging an alarm when one is not needed.
I am satisfied the processor temperature is within limits, - have tested by swapping around.
There is a defined procedure for resetting the main SMC, - does anyone know if the is a similar procedure for resetting the secondary SMC so I can try this before adopting more radical remedies.
At this point it boots fine until processor B starts to warm up (couple minutes) at which point I get a temperature warning light and the machine dies.
After much investigation I have identified the offending device on the tray's circuit board as an F2117TE20H microcontroller which functions as a secondary SMC to the primary SMC on the main motherboard. It seems this is either getting bad temperature data from processor B for some reason, or is misinterpreting it and flagging an alarm when one is not needed.
I am satisfied the processor temperature is within limits, - have tested by swapping around.
There is a defined procedure for resetting the main SMC, - does anyone know if the is a similar procedure for resetting the secondary SMC so I can try this before adopting more radical remedies.