Mac Hooking to TV Problem

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Jun 25, 2013
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So It's worked perfectly in the past, but for some reason when I don't hook my mac to the tv for awhile, the settings mess up.

Anyway this time the problem is black bars. I am hooked to the TV right now and I can see them on the actual mac book screen right now, and on the tv the black bars aren't as long across but still there. How do I make it fit the full screen? It's worked before. All my settings are correct, it's on 720p tv and set on DVI PC.

I just don't get it. Why are there black bars suddenly across the screen at the top and bottom?
 

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