Booting: Cannot get to login screen

Discussion in 'iMac' started by ascomycota, Sep 6, 2009.

  1. ascomycota macrumors newbie

    Joined:
    Sep 6, 2009
    #1
    When I turned my iMac on this morning (iMac G5 PPC 10.5.8) it went through all of the "normal" steps (gong, grey screen, apple logo, progress wheel, blue screen) and stopped at the blue screen. Thinking it was just a fluke, I shut the machine down and restarted, only to have it stop at the blue screen again.

    After disconnecting everything going into the iMac except the keyboard and mouse, I attempted to boot into safe mode but it stopped at the blue screen again. I tried single user mode too but I didn't get any further than the blue screen.

    Next, I flashed the PRAM (big gong, single quieter gong) and afterwards it came to the blue screen.

    I reattached my external drive and selected to boot from a 2-day old backup. Using the backup I was able to log into both my regular account and my "test" account (without login items).

    I still cannot login (except to my external drive backup). Any ideas?:confused:
     
  2. calderone macrumors 68040

    calderone

    Joined:
    Aug 28, 2009
    Location:
    Seattle
    #2
    Disconnect the external. Boot the machine, immediately hold command + v. This will put you in verbose mode, watch for anything odd, namely where it stops. It might just go to the blue screen.

    If you can't figure out anything from there, try some things here: http://support.apple.com/kb/TS1411

    Especially #5

    Code:
    If your computer still starts up to a blue screen, follow these steps.
    Start up the computer in Single-User Mode.
    Type: mount -uw /
    Press Return.
    Type: 
    mv /Library/Preferences/com.apple.loginwindow.plist preferences2.old
    
    Tip: There is a space between ".plist" and "preferences".
     
    Press Return.
    Type: 
    mv /Library/Preferences/com.apple.windowserver.plist preferences3.old
     
    Press Return.
    Type: reboot
    Press Return.
     
  3. iLog.Genius macrumors 601

    iLog.Genius

    Joined:
    Feb 24, 2009
    Location:
    Toronto, Ontario
    #3
    I would try booting to Safe Mode first by holding down the left Shift key on boot up. By doing so, Safe Mode will recreate critical boot files that may have become corrupt which usually is shown with the blue screen. If that doesn't work, try the method above.
     
  4. calderone macrumors 68040

    calderone

    Joined:
    Aug 28, 2009
    Location:
    Seattle
    #4
    This is true. Safe Boot deletes the local shared cache (/var/db/dyld/). Just a note, the actual recreation of the shared cache happens when you boot normally after having safe booted.
     
  5. ascomycota thread starter macrumors newbie

    Joined:
    Sep 6, 2009
    #5
    calderone and iLog.Genius,

    Thanks for the help. I'll try the safe boot again tomorrow morning (I'm away today). If that doesn't work I can try single-user mode again as well.

    If I am still unable to get past the blue "wall", is there a way I could do it via firewire and my MacBook?
     

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