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Troubleshooting General/ Logic Board Troubleshooting - 10
Logic Board Troubleshooting
Power Mac G4 (all models except PCI Graphics)
Processor Module
The logic board comes with a removable processor module. The
processor should rarely fail and should be replaced only as a last
resort. Processor modules can be ordered from Service.
Refer to “Processor Module” in the Take Apart chapter for more
information.
Resetting the PMU on the Logic Board
The PMU (Power Management Unit) is a microcontroller chip that
controls all power functions for the computer. The PMU is a
computer within a computer. It has memory, software, firmware,