Mac Troubleshooting: Resetting Macintosh PMU

The PMU is in different locations on different models of G3, G4, G5. If you need to reset Mac PMU, these are some simple instructions to follow if resetting the PRAM ( Parameter RAM ) and the NVRAM (non-volatile RAM) doesn’t work. How to Reset Mac PMU I have collected images to help you locate the PMU.

iMac G3 500 Mhz (Indigo)

Resetting the PMU: iMac G3 500 Mhz (Indigo)

Power Macintosh G4 1.0Ghz Dual Processor (Mirrored Drive Doors)

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

Power Macintosh G4 667 Mhz (Graphite)

Power Macintosh G4 PMU Reset Button

Power Macintosh G3 350 Mhz (Yosemite)

Power Macintosh G3 PMU Reset Button

Power Macintosh G4 450 Mhz (Graphite)

Power Macintosh G4 PMU Reset Button

Looking for something?

Use the form below to search the site:

Still not finding what you're looking for? Drop a comment on a post or contact us so we can take care of it!

Mac Users Guide Forum

    It Seem There Is Something Wrong With BBLD Configuration, Please Check It.