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DazzaG Level 1 Level 1
I don't know if this is just coincidence or not, but since updating my iMac to 10.6.3 it keeps on crashing. On 3 separate occasions today, whilst using my Mac the screen has gone completely black with thin white lines down it.....see pic below:

The fans and hard disk are still running but it will not respond to any keyboard or mouse presses - I simply have to turn it off by holding the power button in.
It will then restart as usual.

Anyone got any ideas? Do you think that if I was to re-install Mac OS X from my original install disk it could solve the issue?



24" intel imac 2.8Ghz, Mac OS X (10.6.3)
  • weezyfosheezy Level 1 Level 1
    I hate to waste your time but I'm having a very similar issue and can't figure out why. My screen get's chunks or blocks of distorted applications I'm running and then begins to hang. I've noticed it occasionally before I upgraded today. But I ran whatever OSX upgrade today and I've had to reboot four times since due to an unreadable or hung screen. I initially thought it was a memory leak in firefox but as of now, I haven't identified the offending app. If I figure anything out, I will post.
  • Carolyn Samit Level 10 Level 10

    Try Resetting the PRAM

    If that doesn't help, try Resetting the SMC

  • DazzaG Level 1 Level 1
    Tried this already....problem still persists

    Anyone got any other suggestions?
  • bumpskier176 Level 1 Level 1
    Try going to the Apple support downloads and re-install the 10.6.2 update. I'm in the process of this now, as my system has also been crashing randomly since the update. Been getting a black screen or spinning ball of death and it's getting ridiculous. Good luck!
  • bumpskier176 Level 1 Level 1
    And I tried... and failed. Wouldn't let me since 10.6.3 was already installed...
  • Andrew Artz Level 1 Level 1
    Experiencing the exact same issue - usually when using iTunes or Safari.
    Screen becomes garbled with junk video artifacts, network connection drops and then the only thing I can do is move the mouse around. I cannot interact with the screen at all. The only "fix" is to do a hard power-down via the power button on back.

    There seems to be no rhyme or reason to the freeze - it is not reproducible in any timeframe or activity.

    I attempted the following to rectify:

    • Reformat
    • Reinstall 10.6.0 from SL DVD
    • Created entirely new user
    • Repaired permissions via Disk Utility on first login
    • Restarted
    • Updated OS to 10.6.3 from Combo update
    • Repaired permissions via Disk Utility again
    • Restarted three times to build up caches
    • System froze as before after roughly 25 minutes of web browsing and browsing iTunes Store

    This points to a major graphics update bug - there is not other explanation. I have never had this kind of freeze in the two + years that I have owned this machine.

    It has happened 6 times since 10.6.3 was installed.
  • manriki Level 1 Level 1
    I'm not solving this, but just wanted to confirm I had the same problem since upgrading to 10.6.3. My screen just turns all black and the system freezes. Never had a problem with this Mac so pretty frustrated.
    It's happened a couple of times now.
  • picaman121 Level 1 Level 1
    Since updating to 10.6.3, my 24" 3.06Ghz iMac now freezes for no apparent reason. It is doing it all the time, where as before the update it never did. The only way out is to restart. Cursor becomes completely stuck. Way to go Apple. What other crap you got up your sleeve for us?

    Looks like it's time to go back to 10.6.2. What a royal PITA!

    Hey Apple! You listening to this stuff going on here? *** are you guys doing?
  • M_Landers Level 1 Level 1
    Andrew, when you reinstalled back to 10.6 did it happen while using this version or did it only happen after upgrading back to 10.6.3?
  • DanShilstone Level 1 Level 1
    A user at the office reports the same issue on her 2008 24" iMac (I showed her the picture from this thread). Is my only solution going to be reinstalling 10.6 and then updating to 10.6.2?
  • Andrew Artz Level 1 Level 1
    For clarification -
    This issue continues to persist only on 10.6.3
    It will not replicate on 10.6, 10.6.1 or 10.6.2

    Never had this issue until 10.6.3. I am currently using 10.6.2 on this iMac until the issue is verified and a patch is issued by Apple. I suspect a graphics update will be pushed out. My idea is that it is possibly faulty updated video drivers or an overstressed video card from the new 10.6.3 video requirements / changes.
  • Vibbers Level 1 Level 1
    Happy to see that I´m not alone with this issue. My iMac i7 has blacked out (screen output disappears) several times per day since the 10.6.3 update. If I leave the computer well alone it will stay on for hours without problems, but the crashes seem to be provoked by user activity (seemingly random).
  • M_Landers Level 1 Level 1
    I think the best solution right now would be to reinstall Snow Leopard and manually upgrade to 10.6.2 and wait for another update to be released.
  • picaman121 Level 1 Level 1
    I have reinstalled Snow Leopard and upgraded to 10.6.2. No more freezes to report. Machine feels boggy though. Finder activity doesn't have the zippy feel it used to. Click on a file and there's a second or two of latency before it actually highlights. Moving between apps is mushy as well. Hard drive is only half full. Could be residual stuff from 10.6.3 still affecting the system? Would love to do a full wipe of the drive and reinstall from scratch but that is way too much work.
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