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Additional Procedures PRAM and Power Manager Reset - 3
2 Power on the computer by pressing the Power key.
3 Immediately hold down the Option-Command-P-R keys.
4 Keep holding down these four keys until you have heard
the startup chime at least one additional time after the
initial startup chime.
(If the PowerBook emits multiple chimes when you are
holding down the Option-Command-P-R keys, skip to
Step 7.)
Note:
Unlike other PowerBook models, these PowerBook
computers often emit only a single startup chime. Then
the screen goes dark/blank and the green sleep light
stays on (it does not blink on and off as it does when the
computer is in sleep mode).
5 Press the Reset button once and, after a brief pause, the
PowerBook should start up.