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Troubleshooting Power Manager Reset/ - 3
Power Manager Reset
If a unit crashes or experiences power problems, reset the power
manager chip by pressing the rear power switch for 30-45
seconds.
If resetting the power manager chip does not solve the problem,
reset the code for the power manager chip by removing all power
sources and letting the unit sit for 10 minutes. (Take out the
battery and disconnect the AC adapter and the internal backup
battery.) This forces the PowerBook Duo to reload the power
manager code from the system software.