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iMac - 30 second freezing

In a lab of 27 iMacs, several have begun to freeze up for about thirty seconds at a time, intermittently, then function as if nothing had happened.  This happens on machines with both MacOS8.5 and 8.6.
How do I fix this?
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1 Solution
Where does the freeze occur? Can you move the mouse during the freeze? Do they have remote volumes on the desktop (shared)? Have you run Norton Disk Doctor on them?
I had the same exact problem on an iMac running OS 8.6.  Reinstalled the OS a few times and about to reformat the HD when I deceided to check Apple support for any clues.  Found a list of updates that deal w/ the iMac specifically and this intermitant freezing.

This one should resolve the problem


Here is the list of all iMac updates from Apple:


Sorry the second link doesn't look like it will work properly.  Think it is too long.

Here is the link to the Apple Software Downloads section.  If you click on the "Fast Search-iMac Updates" link you will go to the iMac updates I mentioned above.


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