Lost Cursor Control and locks up after putting the iMAC to sleep

Has anyone an idea why the iMAC locks up and will not accept mouse of tracker controls after putting to sleep for a awhile?

Yes, just put your computer to sleep whenever you judge it right.
The three nightly maintenance tasks are not important enough to change your habits,
they do not affect OS X performance: only disk space.
And yes, since 10.4.2 they are automatically delayed if your computer was sleeping, but you still have to run them manually
— all three together once a month is fine —
if you sometimes shut down or reboot your computer.
Use this Terminal command
sudo periodic daily weekly monthly
or one of the "cache-cleaners" utilities like Cocktail etc.
HTH
Axl

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    Yes, just put your computer to sleep whenever you judge it right.
    The three nightly maintenance tasks are not important enough to change your habits,
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    And yes, since 10.4.2 they are automatically delayed if your computer was sleeping, but you still have to run them manually
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