paulpen
Level 1 (34 points)
Apple Music

Q: How to restart??????????

This is sickening. Is there any way to restart a G4 (hemisphere) iMac WITHOUT having to turn off the power..?

 

The system will NOT startup and i'm trying to diagnose whether the hard drive or RAM has gone bad. Nor will it start up from a Firewire drive w/ OS 10.5.

 

So i'm trying things in open firmware and other things that require repeated restarts. Repeatedly forcing the power to turn off, then turning it back on traumatizes the hardware.

 

I'm thinking of something like Ctrl+Alt+Del on a Windows PC.

 

On my Beige G3, with its older (and better) keyboard, you could press Cmd+Option+Power (or was it Cmd+Shift+Pwr?) under almost any circumstances and that would reset it, causing a restart. Thanks.

PowerMac, Mac OS X (10.4.11), G4; G5; Dual-Core iMac.

Posted on Mar 30, 2013 5:39 PM

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paulpen

Q: How to restart??????????

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  • Helpful answers

  • by Kenichi Watanabe,

    Kenichi Watanabe Kenichi Watanabe Mar 30, 2013 7:34 PM in response to paulpen
    Level 8 (39,273 points)
    Mac OS X
    Mar 30, 2013 7:34 PM in response to paulpen

    The way to force a shut down on more recent Macs is to press and hold down the power button.  Doing so is not "tramatic."

     

    You may want to hold down the keys to do a Reset PRAM.

     

    http://support.apple.com/kb/ht1379

     

    You can also reset PMU (power management)

     

    http://support.apple.com/kb/ht1712

     

    A weak or dead PRAM battery can cause odd startup proiblems.

  • by rccharles,

    rccharles rccharles Mar 31, 2013 11:39 AM in response to Kenichi Watanabe
    Level 6 (8,496 points)
    Classic Mac OS
    Mar 31, 2013 11:39 AM in response to Kenichi Watanabe

    Sometimes if volumes don't appear in Startup Manager (what you get when you hold down the Option key at startup), 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

     

    How to eject a cd from the internal cd drive:

    eject cd

     

    List of devices:

    devalias

     

    List of variables:

    printenv

     

    --------------------------------------------------------------

     

    if you are in the terminal

    man shutdown

    shutdown -r now