Resetting your firmware will reset all firmware settings back to factory defaults. Things like the boot rom, power management, etc. are found in the firmware. To do this hold down the following buttons on your keyboard at boot up:
cmd+opt+O+F
Once in open firmware type these commands:reset-nvram (hit return)
reset-all (hit return once more, the system should reboot)
reset-all (hit return once more, the system should reboot)
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