Computer resolution randomly changed

Hi, Im using my tv as a monitor for my computer.  The other day the resolution changed from widescreen to fullscreen and I now have black bars on either side of the image.  The resolution says it is 1024 x 768 which should be widescreen right?  No other resolutions work using the tv as a monitor anymore.  How can I fix this?  Thank you.
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Thank you for the additional information.
I believe that the Aspect Ratio might have changed from 16:9 to 4:3.  If you look a P. 33 in the manual for the TV it talks about Auto Aspect Ratio.  When it is set to 4:3 normal (4:3 normal      Natural (with sidebars)) it states that it has side bars.  This is what I believe the black bars are on the screen.  Take a look at the settings to see if this is the problem.
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