Macbook to HDTV black bars

Hello,
I am running my macbook in clamshell mode connected to my new 40 inch Samsung LN40A500TF TV, I am using the mini dvi to VGA connector and have the resolution set to 1920*1080, everything works pretty well except the screen is sandwiched and centered between black bars perhaps an inch thick on either side... (Other than this it looks good, no distortion etc.)
Anyone encountered this before? I have played with the TV options and the macbook resolution looks right... if anyone has had a similar issue any guidance is welcome.
Thanks.

You could try the below trick that others have successfully used to try and get 1080p on your MB.
Open Displays Preferences and put a check mark in the "Show displays in menu bar" box.
Click on the resulting display icon that shows up in the menu bar to get the drop-down menu.
Scroll to "Number of Recent Items" and set it to 10.
Now drop the menu again from the menu bar and see if another 1080 resolution has shown up. Some people claimed they needed to restart, too. Often times a second 1080 resolution shows up and it is 1080p, although it may not say so. But you can confirm it from the TV, which will often have a setting like INFO or something like that where is shows the format it is receiving.

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