8 Replies Latest reply: Sep 28, 2010 9:33 AM by MisterMojo
Richard Holberg Level 1 (0 points)
We've seen a troublesome issue occur since upgrading recently to Snow Leopard. The iMac will freeze at random times. The mouse pointer simply stops moving - no spinning beachball. The keyboard also becomes inactive during these freezes. The only recourse is to reboot... which solves the problem... for a while. Within a few hours... and totally at random... the mouse will freeze. It doesn't happen when the mouse is moving, just after periods of inactivity (sometimes just minutes of inactivity - not enough time to initiate the screensaver).

I did boot the computer into Safe Mode and the freezes did not occur for two days. As soon as I booted back in normally, the freezes occurred within 2 hours.

Any ideas greatly appreciated.


iMac 24", Mac OS X (10.6.4)
  • DaddyPaycheck Level 6 (16,030 points)
    What programs are you running when this happens? Have you checked for updated driver software from the various manufacturers of your peripheral devices?
  • Richard Holberg Level 1 (0 points)
    Simple apps are open... Mail, Safari, iTunes, iPhoto. Freeze can occur after using any of these.

    No peripherals connected except a USB hub.
  • farazthambi Level 1 (0 points)
    I am having the same issue on my MBP. It freezes every two seconds when I try to open mail, firefox etc
  • dwb Level 7 (22,625 points)
    As odd as it might sound, step 1 disconnect the hub and reboot. Hubs can cause problems. Step 2, if that doesn't work, create a new user account and log into that account to see if the problem follows that account.
  • Richard Holberg Level 1 (0 points)
    Not odd at all... disconnecting the hub solved the problem. Thanks very much!!
  • dwb Level 7 (22,625 points)
    You have no idea a) how many times I've seen this solve Mac & PC crashing problems and b) how many times I've been told I'm an idiot for suggesting it
  • StevenMcd33 Level 1 (0 points)
    had the same problems for three weeks since upgrading my imacs Leopard to Snow Leopard, Constant crashing and random black screens. I tried resetting everything recommended, using disk utility to fix permissions and even a fresh install, but it did not make any difference.

    Four days ago i started my imac in I think it's called Super User or Single User Mode

    Turn off your mac
    Hold Down "Shift + S"
    then press the power button and hold "Shift + S" until you are prompted to enter your password

    Safari, Autodesk Maya used to crash every five minutes and now i can use them all day without a problem, I think the problem is to do with permissions that disk utility cannot fix.
  • MisterMojo Level 1 (0 points)
    I have been having similar problems since upgrading my iMac last week.

    I also have a USB hub and I would be happy to disconnect it to see if it solves the problems...

    But what do I do with all my USB devices and only a couple of available ports on my iMac?