Connecting Mac to TV Question

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? And usually I would NEVER see black bars just on the computer itself.

Hello Tawnypelt,
The following articles provides information that may be helpful in getting rid of the blank space on your displays.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/HT1573
Cheers,
Allen

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