My IMac shunts down or the mouse freezes seems to be after installing OS Lion

my IMac shuts down and I have to unplug it and turn on again or the mouse freezes and I have to restart the computer

I tried that solution, but it didn't help in my case. There is a workaround that usually works, though:
When the RMB stops working, use the "screen zoom" function (ctrl + mouse scroll ball) to zoom in to the screen a bit, then zoom out again. This usually makes the RMB start working again, at least for a while. If it doesn't help, then rebooting the computer usually does.
Still looking for a more permanent solution though.

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    <Edited By Host>

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