Mouse locks when iMac awakes from Sleep or FrontRow

Have just gone back to Mac after four years of gloom on the PC. Bit nervous about being an early adopter but couldn't resist.
So, brand new two-day-old iMac, and it appears to have a problem: When the iMac goes to sleep, or if it is in Frontrow mode, and it awakes or is switched back to the Finder respectively the mouse is completely dead. At first I thought that the system was hanging (having read reports of similar problems on here) but I have discovered that simply by unplugging the mouse and replugging it in, the mouse comes back to life.
Anyone have any ideas? Everything else appears to work fine - so far.

Bill, good question,
there should be some default shortcuts:
Toggle keyboard access on/off --------------------
control F1
focus to the menubar --------------------
control F2
focus to the active window --------------------
control F4
focus to the window toolbar --------------------
control F5
Thanks! I didn't know about holding "control" with F2.
Now I know what to do if the mouse locks again:
control F2, then press arrow down a few times to get to "Restart", then press return.

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Mouse locks when iMac awakes from Sleep or FrontRow

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