Question about Apple PowerBook G4 Mac Notebook

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PowerBook g4 won't wake from sleep, won't shut off (from sleep mode). Please help!

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  • JDTec
    JDTec May 11, 2010

    I just got mine back from Apple repair. It had the same problem, they changed the motherboard.

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  • Apple Master
  • 4,338 Answers

Found this, it may help you solve your issue. Power issues on Mac G4 The PMU is a microcontroller chip that controls power functions for the computer. The PMU is a computer within a computer, as it has its own memory, software, firmware, input/output, a CPU, and more. Its function is to:
§ Tell the computer to turn on, turn off, sleep, wake, idle, etc.
§ Manage system resets from various commands.
§ Maintain parameter RAM (PRAM).
§ Manage the real-time clock.
Over time, the settings in the Power Manager may become unusable, which can result in operational anomalies with the computer. Examples include not turning on, not waking from sleep, or not seeing devices plugged into the USB and FireWire ports, among others.
Resetting the PMU is not intended for resolution of a stall or situation in which the computer is unresponsive. A PMU reset should not be necessary except as a last resort in cases where a hardware failure of the power management system is suspected. Performing a PMU reset returns the computer hardware, including NVRAM, to default settings and forces the computer to shut down.
http://support.apple.com/kb/HT1939
Click on this link or copy and paste the complete link into your browser.
If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe




http://support.apple.com/kb/HT1939

Posted on May 16, 2009

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Have you solved your problem.
Since you are taking it apart look at the folowing:

PMU reset:

The PMU is a microcontroller chip that controls power functions for the computer. The PMU is a computer within a computer, as it has its own memory, software, firmware, input/output, a CPU, and more. Its function is to:
§ Tell the computer to turn on, turn off, sleep, wake, idle, etc.
§ Manage system resets from various commands.
§ Maintain parameter RAM (PRAM).
§ Manage the real-time clock.
Over time, the settings in the Power Manager may become unusable, which can result in operational anomalies with the computer. Examples include not turning on, not waking from sleep, or not seeing devices plugged into the USB and FireWire ports, among others.
Resetting the PMU is not intended for resolution of a stall or situation in which the computer is unresponsive. A PMU reset should not be necessary except as a last resort in cases where a hardware failure of the power management system is suspected. Performing a PMU reset returns the computer hardware, including NVRAM, to default settings and forces the computer to shut down.
http://support.apple.com/kb/HT1939
Click on this link or copy and paste the complete link into your browser.
If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe



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