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Troubleshooting Power Manager Reset - 2
Power Manager Reset
Reset the power manager if
The battery and power adapter are proven good, but the
computer will not power on.
The computer will not reset after a system crash.
To reset the power manager in the Macintosh PowerBook 550c,
Remove the AC adapter and the battery.
Let the unit sit without power hooked up for 3–5 minutes.
Simultaneously hold down the Control, Command, Option, and
Power On keys for 5–10 seconds.
Reinstall the battery and, if necessary, reconnect the AC
adapter.
Turn on the computer.