With the top case removed, the power button is disconnected. Instead of having to reconnect the top case to turn on the system, there are two pads on the logic board that can be shorted across (with a tool like a flat blade screwdriver) to act as the power button.
These pads are located about 5cm left of the back left corner of the optical drive, 1-1/2cm above the notch for the top case flex cable. It is marked POWER BUTTON. The pads are separated with a vertical white line.
Note: The component designators my be different, but the location of the pads are the same as illustrated.
Resetting the Power Manager Unit (PMU)
There are different methods to reset the PMU depending upon the computer. See appropriate computer headings below.
PowerBook G4 (17-inch Double-Layer SD) and PowerBook G4 (17-inch 1.67GHz):
The PMU reset key sequence has been changed. Use the following procedure or the PMU Reset pad (see PMU RESET pads on logic board, below).
PowerBook G4 (17-inch 1.5GHz) and PowerBook G4 (17-inch 1.33GHz):
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