Mac Troubleshooting: PowerMac G4 1.0Ghz Dual Processor (Mirrored Drive Doors)

The PowerMac G4 (Mirrored Drive Doors) features dual 1.0 GHz PowerPC (G4) processors each with an AltiVec velocity engine, 256k cache, and 1 MB of DDR SRAM backside cache. It shipped configured with 256 MB of RAM upgradeable to 2 GB, 2X DVD-R/CD-RW “SuperDrive”, 4X AGP ATI Radeon 9000 Pro graphics card with 64 MB of DDR SDRAM and an available AirPort (802.11b). One of the last versions shipping with Mac OS X 10.4.11 “Tiger” capable of booting into Mac OS 9 and using Mac OS 9 applications within the Mac OS X “Classic” environment.

Resetting the PMU: Power Macintosh G4 1.0Ghz Dual Processor (Mirrored Drive Doors)

Apple produced two different series of its Power Macintosh G4 using two different logic boards. Highlighted in red is where the PMU (Power Management Unit) or Cuda Switch is located on a this 1.0 Ghz Dual Processor PowerMac G4. It is usually in between the processor and the system battery on the mother board. To reset the G4 PMU follow these instructions. DO NOT RESET IT IF THE COMPUTER IS ON!!!

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