Dell Inpsiron 560 (Late 2009) - Manual (Page 243)

Connecting Your Computer to a TV and Adjusting Display Settings
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Depending on the video card installed in your computer, your computer may
have a special video control panel with extensive help information. The video
card control panel may also provide special wizard software to enable the TV
display option, along with custom display settings.
Setting Display Resolution With the Windows Display Properties Menu
Use the Windows Display Properties menu to adjust the display resolution
for the computer display.
NOTE:
You can also use the video card control panel available through the Display
Properties menu. From the Display Properties window, click Settings → Advanced.
Then select the tab for the video card vendor . For more information, see "Adjusting
Display Settings With the Vendor Video Card Control Panel" on page 246.
NOTE:
To display a program at a specific resolution, both the video card and the
display device must support the program, and the necessary video drivers must be
installed.
HINT: If you are using a TV as a second display device, the best
method for configuring the display resolution is the video card control
panel available through the video card installed in your computer.