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G4 stuck at startup - erase disk with firmware command?

2051 Views 7 Replies Latest reply: Jan 14, 2008 1:39 PM by Wimy RSS
Wimy Calculating status...
Currently Being Moderated
Apr 13, 2006 3:13 PM
Good morning, my old G4 suddenly spat the dummie and refuses to startup, regardless what I do. (disk utily couldn't fix the damage nor did Techtool)Now everytime I try to start from the cd it goes into firmware mode. As it is an old G4 used for testing websites I have no prblems erasing the hard disk but.... the question is how do you do this with only the firmware command line available?
Powerbook 17 1.5Mhz 80G, Mac OS X (10.4.6)
  • Charles Minow Level 6 Level 6 (9,190 points)
    Currently Being Moderated
    Apr 13, 2006 4:21 PM (in response to Wimy)
    Have you tried resetting the PRAM? Reboot and hold down the command-option-"p"-"r" key combination until it chimes a time or two. That might fix you up.

    What happens if you type mac-boot at the firmware command line?

    charlie
    PowerBook G4, Mac OS X (10.4.5)
  • Charles Minow Level 6 Level 6 (9,190 points)
    Currently Being Moderated
    Apr 13, 2006 6:20 PM (in response to Wimy)
    DO you know a way to erase the lot from the firm ware
    command?


    I don't believe that's possible, as the open firmsare doesn't handle mounting disks and such. For that, you'd need a working OS somewhere.

    Try this at the open firmware prompt:

    reset-nvram

    followed by:

    set-defaults

    followed by:

    reset-all

    That should conclusively reset your open firmware.

    I think it should reboot after the second command. If it doesn't try the mac-boot and see if it starts up.

    charlie
    PowerBook G4, Mac OS X (10.4.5)
  • Charles Minow Level 6 Level 6 (9,190 points)
    Currently Being Moderated
    Apr 14, 2006 2:50 PM (in response to Wimy)
    Hmmm. I'm a bit stumped. If you have a FireWire cable handy, you could try booting it into FireWire Target Disk mode. Just hold down the "t" key until you see a floating FireWire symbol on the screen. Then you can connect it to your PowerBook and erase the disk from there.

    You aren't by some chance trying to boot from your PowerBook's discs are you? That's likely not to work. You'll either need the original discs from your G4 or a retail copy of the OS.

    One more thing to try would be to put the CD in the G4 and reboot, holding down the option key and see if you get a screen with the CD as a possible boot option.

    Otherwise, I'd have to wonder if you had a hardware failure that precipitated all of this in the first place.

    charlie
    PowerBook G4, Mac OS X (10.4.5)

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