5 Replies Latest reply: Nov 19, 2009 8:43 PM by Tatartatartatartatartatar
Tatartatartatartatartatar Level 1 (0 points)
when I try to shut down the computer, the dock and a tool bar recede, the screen goes pale, those little black lines start to chase each other, but then, it stays like that indefinitely. So, I have to use the power button on the back, to turn the computer off. That, after I boot it up and restart it, I could shut it down properly.
What seems to be the trouble...?


IMac G5, Mac OS X (10.3.x)
  • K Shaffer Level 6 (12,582 points)
    Not sure, other than just doing a bit of routine and basic system
    maintenance that helps keep the computer running OK...

    If everything else is OK with the computer and this is the only
    possible issue, the answer may be as simple as running Disk
    Utility to 'repair disk permissions.' Or, as I sometimes do, if I'm
    bored and want to exercise the computer further, I start up in
    SafeBoot (shift key held on start until SafeBoot startup appears
    and continue until you get a desktop) then run Disk Utility to
    repair disk permissions, when done, quit D.U. & restart normally.

    If the hard disk drive is getting fuller than 80% the computer
    could be taking forever to sort through the files and finally
    get around to the shut-down routine. By force-quitting or
    pushing the power button before it can really do anything to
    the final extent of a routine, you may be adding to this issue.

    Depending on other factors (unknown to me) and if there is
    no evidence of hardware or software damage, and more
    rarely, some shutdown and startup issues may be related
    to a power management problem. To reset that circuit would
    be among the last efforts of a desperate person. You have
    to try and troubleshoot the issue; if you have not performed
    any basic or preventative maintenance, try that first.

    If the hard disk drive is more than 70% full, you may have to start
    removing content to an off-computer archive and free up some
    larger chunks of hard disk drive so it will have more free-space.
    Mac OS X uses free-space in addition to the installed RAM chips
    to add system and app support; free-space can be used as an
    automatic Virtual Memory supplement and everything in the Mac
    can use some free space as virtual memory or VM. When it is
    not available, the existing full space gets overwritten or corrupt.

    If the system and other files get corrupted, there may also be
    damage to the actual hard drive; sometimes just the directory,
    but other times, the drive itself may fail & need replacement.

    So, it is really hard to say exactly what is causing your Mac to act
    up the way is presently is, but the shut-down method is doing harm.

    About every month or so, I run a free utility tool by the name of OnyX
    from Titanium Software (versions for different OS X are on their site)
    and have it run everything in that tool's "automation" selection. I also
    have that tool's preferences set to restart the Mac when that is done.
    (It can take upwards of 45 minutes, depending on the computer.)

    You could try finding out how much free space and other system
    resources are available (and used) in the computer via Activity
    Monitor and also in sections of the System Profiler. Also, it may
    not hurt to boot the computer from the OS X installer disc and
    have that run its own version of Disk Utility (see menu bar header
    in Installer, when computer is running from the booted install disc)
    and choose to repair disk, then after that is run, repair the disk's
    permissions; and then check to see if the hard disk is Verified;
    as it may be failing. (Even if is says verified or passed, it may fail.)

    How much RAM is installed, and what are the numbers relating to
    the capacity used and amount free, in the hard disk drive?

    The answer is in there somewhere...
    Good luck & happy computing!
  • K Shaffer Level 6 (12,582 points)
    PS: last and sometimes not least, there is a
    power management unit or system controller
    reset button or procedure you may undertake
    to see if the computer will can resume normal
    operations; this is usually a last result if it is
    known all other normal routines, maintenance
    and care have been done over time.

    iMac G5: How to Reset the SMU (power controller)

    Hopefully this helps...
    Good luck & happy computing!
  • The Bohemian Level 3 (525 points)
    I had this happen with mine just last week. But, I remembered that there were two of us 'logged in' and switching windows back and forth until I just went to shut it off. Perhaps it was trying to do the shuffle with both log-ons and get all the loose ends in the right places. After about 5 minutes, I used the power button to shut it off.

    Logging back in all seemed normal... for both of us. Anyway for what we have done on it since then. However now we do log-off any other account leaving only mine (the administrator) open before going into a shutdown.

    It was my daughter with 3 separate accounts that alerted me to this, as when those accounts are in 'fast user switching' and she shuts it off, it can go for half an hour before it finally shuts off (she was scared to force it not knowing what it would do next).

    When all the other accounts have already been handled one-by-one, leaving only my one account at shut-down, it does it in about half a minute.

    However, I do do regular maintenance and monthly permissions repairs, plus my drive is only half full. This could of aided the fast recovery from the force off I did.
  • K Shaffer Level 6 (12,582 points)
    Sometimes, if a computer is trying to index a hard disk drive or
    other slow task about the time you'd want to shut it down, things
    may stick or hang there awhile. When the computer goes so far
    at shut-down (as to hide the Dock and give you no option to stop
    the process of shutting down) one has to start looking for repairs.

    To force-quit and/or push power button, or pull the plug, are a
    few more indicative signs of a few things needing more attention.

    {Although I'd never used Panther's fast-user switching, I did look
    into it and decided the few times I needed to run my secondary
    accounts, I would not need them any faster than a normal login.}

    We'll see if routine maintenance or any other voodoo will do do.

    Until that time...
    Good luck & happy computing!
  • Tatartatartatartatartatar Level 1 (0 points)
    Thanks for the info, I think it will help...