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There is no way he bought an iMac Lemon. Apple hasn't made iMac's with fruit named colors in a decade.
 
Well, assuming the query is genuine I would suggest three basic initial steps in the following sequence:
1. Reset Safari
2. Repair Permissions
3. Shutdown Computer and reboot.

That at least cleans up the system. If problems persist further analysis can be done...

Vanilla
 
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