For computers with Mac OS X 10.8 or later, if you have trouble getting your display to work with the computer, access the
System Preferences menu and selection the
Displays option. Then, press and hold the
Option key. In the bottom right corner of the Displays window, you should see a
Detect Displays button. Click that button to force the Mac OS to show all the displays, including the macbook's own display.
Otherwise, try resetting the PRAM:
by holding down the Command+Option+P+R keys on your keybord when you turn it on untill you hear the startup chime.
Happy New Year!
Kerry
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