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Reference


Resetting the Power Manager on PowerBooks

(See also Apple's Knowledge Base article #14449.)

All of Apple's PowerBooks have intellegent power managers that control where power comes from (AC adapter, batteries, etc) and goes to (battery charging, logic board, hard drive, etc). Unfortunately, these managers can sometimes get confused, and rebooting the computer will not usually correct the problem. If a PowerBook is displaying power-related anomalies (including refusing to start up at all), resetting the power manager may help.

WARNING

All of the Power Manager Reset procedures that follow for all of the Macintosh PowerBook computers will permanently remove a RAM disk, if present, and all of its contents. They may also reset the system clock (to either 1904 or 1956), as well as settings stored in the parameter RAM, such as the desktop pattern, network, trackpad, memory, and power conservation.

Power Manager Reset Procedures

The procedure for resetting the power manager depends on the model of PowerBook (for many models, there is more than one possible procedure). Here is a list of the various procedures, and which models they work on:

Any PowerBook

The Power Manager code can be fully purged by having an authorized service technician disconnect the internal backup battery and letting the unit sit for 1 minute with all power removed (the battery pulled and the AC adapter disconnected). This forces the PowerBook to reload a fresh copy of the code from the ROMs.

PowerBook 100

  1. Shut down the computer.
  2. Flip the battery contact switch on the rear of the unit to the down position.
  3. Simultaneously press and hold the rest and interrupt buttons on the side of the unit for 15 seconds.
  4. Flip the battery contact switch back to the up position.
  5. Make sure the AC adapter is connected to a live AC outlet then connect the AC adapter to the back of the computer.
  6. Turn the PowerBook on.
  7. Insert the battery.

PowerBook 140 through 180, 1400, 3400, G3 (Kanga/M3553), and Duo 200 & 2300 series

  1. Shut down the computer.
  2. Disconnect the AC adapter from the computer and remove the battery.
  3. This step depends on the model:
    PB 140, 145, 145B, 160, 165, 165c, 170, 180, and 180c
    Let the unit sit without power for 3-5 minutes. Then, use two paper clips to simultaneously press and hold for approximately 30 seconds both recessed buttons (commonly known as the reset and interrupt buttons) located next to the power button on the back panel of the PowerBook.
    Duo 200 & 2300 series
    Press and hold the rear power button for 30-45 seconds.
    PB 150
    Push the reset button in the back of the unit with a paper clip and hold for 30 seconds.
    PB 1400, 3400, and G3
    Push the reset button in the back of the unit and hold for 1 minute.
  4. Make sure the AC adapter is connected to a live AC outlet then connect the AC adapter to the back of the computer.
  5. Turn the PowerBook on. (Note: on the PowerBook 150, push the reset button in back again, but just briefly. You should hear a small pop from the speaker and the computer may power on. If it does not power on, push the main power button in back.)
  6. Insert the battery.

PowerBook 500 series

  1. Shut down the computer.
  2. Press the Command-Option-Control-Power On keys simultaneously and let go. Pressing the keys will not appear to do anything.
  3. Turn the PowerBook on. The screen brightness and contrast settings may need adjusting before the screen is viewable.

PowerBook 5300, 190 Series

  1. Shut down the computer.
  2. Restart your computer and hold down the Command (Apple), Option, P, and R keys. Wait for the computer to make its startup chime twice*. You may then release the keys.
    (*In some cases the machine will only chime once, then the screen will become black and the sleep indicator light will illuminate GREEN - this condition also indicates a successful power manager reset.)
  3. At this point the computer may shut down or continue to start up. If it shuts down, use the small power button on the back to restart the computer.

PowerBook 5300, 190 Series (alternate method)

  1. Shut down the computer.
  2. Remove the power adapter and battery from unit.
  3. Push the reset button in the back of the unit and hold for 30 seconds.
  4. Make sure the AC adapter is connected to a live AC outlet then connect the AC adapter to the back of the computer.
  5. Push the reset button in back again, but just briefly - the computer should power on. If it does not power on, push the main power button on the keyboard.

PowerBook G3 series (Wall Street/M4753)

  1. Shut down the computer (make sure it is shut down, not merely asleep).
  2. Press the Shift-Function-Control-Power On keys simultaneously and let go.
  3. Wait 5 seconds.
  4. Turn the PowerBook on normally.

PowerBook G3 series (Bronze Keyboard/Lombard/M5343)

  1. Shut down the computer (make sure it is shut down, not merely asleep).
  2. Press the reset button on the rear of the computer. The reset button is located between the external video and modem (RJ-11) ports.
  3. Wait 5 seconds.
  4. Press the power button to restart the PowerBook.

iBook

  1. Shut down the computer (make sure it is shut down, not merely asleep).
  2. Press the reset button located above the power button at the base of the display. You will need a small, blunt instrument such as a paper clip to press the button.
  3. Wait 5 seconds.
  4. Press the power button to restart the iBook.
Note: The power manager reset on the iBook also resets the Date and Time. After the reset, the system clock will be set to 12:00AM, 01/01/1904.
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