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Q: how do I reset imac G5

How do I reset aan iMac G5

iMac G5 (17-inch Ambient Light Sensor), Mac OS X (10.4.11)

Posted on Nov 26, 2013 1:06 PM

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Q: how do I reset imac G5

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  • by rccharles,

    rccharles rccharles Nov 26, 2013 1:59 PM in response to bogdacb
    Level 6 (8,486 points)
    Classic Mac OS
    Nov 26, 2013 1:59 PM in response to bogdacb

    What problem are you experiencing with your machine?

     

    you need to reset the Mac's PRAM, NVRAM, and Open Firmware. Shut down the Mac, then power it up, and before the screen lights up, quickly hold down the Command, Option, P, and R keys, until the Mac has chimed twice more after the powerup chime.

     

    Then, before the screen lights up, hold down Command-Option-O-F until the Open Firmware screen appears. Then enter these lines, pressing Return after each one:

     

    reset-nvram

    set-defaults

    reset-all

     

    "The reset-all command should restart your Mac. If so, you have successfully reset the Open Firmware settings."

    http://support.apple.com/kb/TS1812?viewlocale=en_US

     

    Should the fail...

    Try taking the battery out for 10 minutes.  Put battery back in.  Cross fingers. Power the machine back on.

     

    How to eject a cd from the internal cd drive:

    eject cd

     

    List of devices:

    devalias

     

    List of variables:

    printenv

     

    More than you ever wanted to know about open firmware

    http://www.firmworks.com/QuickRef.html

     

     

    ( nvram is the equivalent Mac OS X terminal command. )

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    Resetting your Mac's PRAM and NVRAM

    http://support.apple.com/kb/HT1379

     

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    reset the PMU

    http://mrjcd.com/junk/PMU.jpg

    http://support.apple.com/kb/ht1939