OS X Yosemite: If the picture doesn’t fill the TV screen
If you connected your Mac to a TV and the images don’t fill the TV screen, try turning on Overscan.
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Choose Apple menu > System Preferences, click Displays, then click Display.
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Click Options, then select Overscan.
For more information, see the Apple Support article Learn about overscan and underscan.
Last Modified: Sep 23, 2015