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Apr 30, 2014 5:03 PM in response to enricafromlondonby Eustace Mendis,Try a PRAM reset:
- Shut down your Mac.
- Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
- Turn on the computer.
- Press and hold the Command-Option-P-R keys before the gray screen appears.
- Hold the keys down until the computer restarts and you hear the startup sound for the third time.
- Release the keys.