Mac
OS -
How to Reset The Power Manager of a Powerbook that Won't Boot
This document explains how to reset the power manager for Mac
Powerbooks that won't boot.
The Power Manager is an
integrated circuit that is responsible for power management of Apple
PowerBooks and iBooks. It controls backlighting, hard disk spin down,
sleep and wake, some charging aspects, trackpad control, and various
other features.
Over time, the settings in the
Power Manager may become unusable, which can result in operational
anomalies with the PowerBook. Some examples are:
- not powering on
- not
waking from sleep
- not charging the battery
- not recognizing the AC
Adapter
Resetting the Power Manager is accomplished in a
variety of ways
depending upon the computer. These methods are described below.
WARNING:
Resetting the Power Manager on any PowerBook or iBook will permanently
remove a RAM disk, if present, and all of its contents.
PowerBook and iBook models
covered in this article:
- PowerBook 100
- PowerBook 140, 145, 145 B
and 170
- PowerBook
150
- PowerBook
160, 165, or
180
- PowerBook
500 series
- PowerBook
200 and 2300
Series
- PowerBook
190, 1400,
2400, 3400, 5300 Series, and PowerBook G3 (M3553)
- PowerBook G3 Series
(M4753)
- PowerBook
G3 Series
(Bronze Keyboard) (M5343)
- iBook and iBook
(FireWire) computers
- iBook (Dual USB)
- PowerBook G3 (FireWire), G4 (Original)
- PowerBook G4 (12-inch, 15-inch )
- PowerBook
G4 (DVI) and PowerBook G4 (1 GHz/867 MHz)
- PowerBook G4 (15-inch 1.67/1.5GHz), PowerBook
G4 (17-inch 1.67GHz)
1. Remove
the AC adapter and the battery.
2. Flip the battery contact switch on the rear of the computer to the
down position.
3. Let the PowerBook sit without power connected for 3-5 minutes.
4. Simultaneously press and hold the reset and interrupt buttons on the
side of the computer for 15 seconds.
5. Reinstall the battery, reconnect the AC adapter if necessary and
flip the battery contact switch on the rear of the computer to the up
position.
1. Remove
the AC Adapter and the battery.
2. Let the PowerBook sit without power connected for 3-5 minutes.
3. Using two paper clips, simultaneously press and hold the reset and
interrupt buttons for 5-10 seconds.
4. Reinstall the battery and, if necessary, reconnect the AC adapter.
Note: Both recessed
buttons (commonly
known as the reset and interrupt buttons) are located next to the power
button on the back panel of the PowerBook.
1. Remove
the power adapter and battery from PowerBook.
2. Push the reset button in the back of the computer with a paper clip
and hold for 5-10 seconds.
3. Plug the AC adapter into the AC (wall) outlet.
4. Reconnect the power adapter and push the reset button in back again,
but just briefly. You should hear a small pop from the speaker; do not
be concerned.
5. Push main power button in back (large exposed button). The PowerBook
should turn on.
6. Apple suggests charging the battery for at least 8 hours before
running on battery power.
If the PowerBook powers on, the
battery may be reinserted. If it fails to start, the PowerBook may
require service.
1. Remove
the AC adapter and the battery.
2. Let the PowerBook sit without power connected for 3-5 minutes.
3. Reinstall the battery and, if necessary, reconnect the AC adapter.
Note: Steps 1 and 2
will usually reset
the Power Manager. However, if the computer still exhibits the same
issue, repeat steps 1 and 2 and then follow the step listed below
before reinstalling the battery.
1. Using
two paper clips, simultaneously press and hold down the reset
and interrupt buttons for 5-10 seconds. They are located next to the
power button on the back panel of the PowerBook.
1. Remove
the AC adapter and the battery.
2. Let the PowerBook sit without power connected for 3-5 minutes.
3. Simultaneously press and hold Command-Option-Control-Power On for
5-10 seconds.
4. Reinstall the battery and, if necessary, reconnect the AC adapter.
1. Press and hold the power button on the rear of the 200 or
2300
series computer for 30-45 seconds.*
2. (see Caution) If resetting the Power Manager chip does not
resolve
the situation, reset the code for the Power Manager chip by removing
all power sources and letting the computer sit for 10 minutes.
(Disconnect the AC adapter, remove the battery and the internal backup
battery.) This forces the PowerBook Duo to reload the Power Manager
code from the system software.
**Caution**
Apple-authorized service technicians may remove the internal back up
battery to reset the Power Manager. If you are not an Apple-authorized
service technician, please note that removing the internal backup
battery is not a simple procedure and is not recommended. If anything
is damaged in your attempt to remove the battery, it will not be
covered under warranty.
The PowerBook 190, 1400, 3400, 5300 Series, and PowerBook G3
(M3553)
have two different ways to reset the Power Manager. The only difference
is the location of the reset button. See the table below for the
location of the reset button on each PowerBook series.
| PowerBook
| Reset
Button Location (on rear of computer) |
| 190
Series | Below the video-out port |
| 1400
Series | Between the ADB and
Serial ports |
| 2400
Series | Above the floppy drive
connector |
3400
Series & PowerBook G3
(M3553) | Left
of the Serial port |
| 5300
Series | Below the video-out port |
Resetting the Power
Manager
1. If the
computer is on, turn it off.
2. Restart the computer by holding down the reset button for 10-20
seconds. (See chart above for location of the reset button for your
PowerBook series.)
3. If the computer does not restart, repeat step 2 three or four times.
Resetting the Power Manager and
PRAM
Resetting the parameter RAM (PRAM) when the computer is shut down also
resets Power Manager. The following process resets both the Power
Manager and the parameter RAM.
1. If the
computer is on, turn it off.
2. Make sure the Caps Lock key is not down.
3. Restart the computer. Immediately after hearing the startup sound,
simultaneously press and hold Command-Option-P-R. (If you do not hold
down the key combination within 5-10 seconds after the computer
restarts, you must repeat steps 1-3.)
4. Hold down the keys until you hear the startup sound again. Then
release the keys.
5. If the computer shuts itself off, press the reset button on the back
of the computer to turn it back on. (See chart above for location of
the reset button for your PowerBook series.)
6. When the computer has finished starting up, restore any custom
settings for the desktop pattern, memory, network, AppleTalk, trackpad,
power conservation, and so forth.
1. If the
computer is on, turn it off.
2. Simultaneously press Shift-Fn (function)-Ctrl (control)-power.
3. Wait 5 seconds.
4. Press the power button to restart the PowerBook.
1. If the
computer is on, turn it off.
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.
Note:
When you reset the Power Manager, wait at least 5 seconds before using
the power button to start up the computer. If you do not wait at least
5 seconds, the reset procedure may fail. (If you suspect that the reset
procedure has failed, press the reset button again and wait 5 seconds
before pressing the power button.)
1. If the
computer is on, turn it off.
2. Press the reset button located above the power button at the base of
the display. Use 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: Resetting the
power manager also
resets the Date and Time. After the reset, the system clock is set to
12:00 A.M., 01/01/1904.
1. If the
computer is on, turn it off.
2. Press the reset button
located above the Audio/Video port on the left side of the iBook (Dual
USB).
3. Wait
5 seconds
4. Press the power button to
restart the iBook
Note:
Resetting the power manager also resets the Date and Time. After the
reset, the system clock is set to 12:00 A.M., 01/01/1904.
1. If the
computer is on, turn it off.
2. Press the reset button located on the rear panel of the computer
between the external video and modem ports.
3. Wait 5 seconds
4. Press the power button to restart the computer.
Note: Resetting the
power manager also
resets the Date and Time. After the reset, the system clock is set to
12:00 A.M., 01/01/1904.
PowerBook
G4 (12-inch, 12-inch DVI, 12-inch 1.33GHz, 12-inch 1.5GHz)
PowerBook
G4 (15-inch FW 800, 15-inch 1.5/1.33GHz)
PowerBook
G4 (17-inch, 17-inch 1.33GHz, 17-inch 1.5GHz)
- If
the computer is on, turn it off.
- Reset
the power
manager by simultaneously pressing and then releasing
Shift-Control-Option-Power on the keyboard. Do not press the fn
(Function) key while using this combination of keystrokes.
- Wait
5 seconds.
- Press the Power
button to restart the
computer.
Note:
Resetting the
power manager also
resets the Date and Time. After the reset, the system clock is set to
12:00 A.M., 01/01/1904
PowerBook
G4 (DVI) and PowerBook G4 (1 GHz/867 MHz)
- If
the
computer is on, turn it off.
- Disengage the two
keyboard
latches located between the Esc and F1 keys, and the F11 and F12 keys.
(You may also need to disengage the keyboard locking screw located
between the F5 and F6 keys.)
- Lift the keyboard. To
ensure no
harmful static electricity is transferred to the computer, properly
ground yourself before performing this procedure.
- Press
and
release the reset button located on the upper right side of the logic
board near the power button.
- Wait 5 seconds.
- Press
the power button to restart the computer.
Note: Resetting the
power manager also
resets the Date and Time. After the reset, the system clock is set to
12:00 A.M., 01/01/1904
PowerBook G4 (15-inch 1.67/1.5GHz),
PowerBook G4 (17-inch 1.67GHz)
- If
the computer is on, turn it off.
- Disconnect the AC
Adapter and remove the computer's battery.
- Press
and hold down the power button for 5 seconds and then release the
button.
- Reconnect the battery and AC Adapter.
- Press
the Power button to restart the computer.
Note: Resetting the power manager also
resets the Date and Time. After the reset, the system clock is set to
12:00 A.M., 01/01/1904.
The above information was taken
from the Apple
Knowledge
Base