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Printer addition 10.6 That PDF explains how. If that gives you trouble let me know, I can break it down.
Apple Wireless Keyboards will not recognize pressing and holding down startup keys during startup until the startup chime sound is heard. This is normal behavior. You may find it helpful to press and hold startup key combinations while the startup chime is playing. Two common startup key combinations are listed below.
Press and hold the Command + Option + P + R keys while the startup chime is playing.