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How to Reset Firmware in Macs

Resetting the firmware in a Mac should be performed with caution and only if it is necessary. Reasons why Mac users reset firmware include error messages after the Mac is turned on or problems related to system and device settings not being retained. The presence of these problems might be due to an issue with the battery. If that is not the case, consider resetting the parameter RAM and the non-volatile RAM.

Instructions

  1. Reset PRAM and NVRAM

    • 1

      Press the shutdown button and allow the Mac to turn off completely.

    • 2

      Turn on your Mac. Press and hold "Command" + "Option" + "P" and "R." as soon as you turn your Mac back on (before the gray screen appears).

    • 3

      Release them after the you hear the startup sound for the second time. PRAM and NVRAM has now been reset to default status.

    Startup Error

    • 4

      Turn on the Mac. Notice the error message "To continue booting, type 'mac-boot' and press return."

    • 5

      Type "reset-nvram" at the prompt as opposed to "mac-boot." Press Return.

    • 6

      Type "reset-all" when the Open Firmware prompt displays. Press "Return" again. Your Mac will restart with the firmware settings reset.

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