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I'm sorry about the issue. Does this issue occur every time you shut down / restart the computer?
Does this issue occur when you open a particular application? Or does it occur automatically even if you have quit / closed all applications?
Please reply at the box below. Thank you,
Can you tell me the exact version of OS X you are currently running, please?
Click the Apple logo in the menu bar at the top left of the screen
Select "About This Mac"
In the window that opens, look for the "Version" information. Please let me know what it says.