![]() If all else fails, I’d say maybe something went wrong during the flashing process and the EFI is damaged, in which case you’d have to retry that entire process. ![]() So, swap the CPUs into each others slots, see if the light changes to the opposite LED. For 8 core riser boards only: determine if theĮrror LED follows the processor by swapping processor A and processor B locations. Grease is applied, and verify the fan is operating. Undamaged and properly connected to the processor board, check that adequate thermal However, if you wanted to see if its truly a CPU related issue, it suggests:ĭetermine if the error LED follows the processor heatsink verify the heatsink is physically Indicates the associated processor may be missing or in overtemp state (PROCHOT). The following illustrations show the location ofĮach LED and its associated processor. ![]() The 8-core and quad-core riser boards include a diagnostic LED for each processor that youĬan use in troubleshooting processor issues. The only thing that comes to mind is maybe an EFI-related problem.Ĭoming straight from the Mac Pro 2009 Technician Guide, the description of the CPU Diag LEDs states: When it comes to any seemingly hopeless Mac issue, I go there. I would suggest booting into verbose mode to see if the boot process spits out any recognizable errors that you can search up. ![]()
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