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| | Resetting PowerBook and iBook Power Management Unit (PMU) |
 | | After the reset, on some iBooks and PowerBooks, the system clock is set to 00:00 (GMT), 01 Jan 1970 for computers with Mac OS X or 00:00, 01 Jan 1904 for computers with Mac OS 9. |
 | | A PMU reset should not be necessary except as a last resort in cases where a hardware failure of the power management system is suspected. |
 | | iBook (16 VRAM), iBook (14.1 LCD 16 VRAM), iBook (14.1 LCD 32 VRAM), iBook (32 VRAM), and iBook (Opaque 16 VRAM), iBook (Early 2003), iBook (800 MHz 32 VRAM), iBook (900 MHz 32 VRAM), iBook (14.1 LCD 900 MHz 32 VRAM), iBook G4, iBook G4 (Early 2004), iBook G4 (Late 2004), iBook G4 (Mid 2005) |
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