Toshiba high-definition TVs have two settings for wide-screen, depending on whether or not you want to enable overscan. Overscan crops the edges of the image and zooms the remaining part of the image to fit the screen. Overscan can be useful if you're watching a television broadcast with junk data on the edge of the picture, but it can lop off the Windows task bar when using the TV as a monitor. You can disable overscan for HD sources by switching the TV's picture size.
Press the picture size button on the remote control. It's the center button in the second row of keys. A menu appears on the screen.
Highlight "Native" using the directional buttons.
Press the "OK" button to confirm.