Dell Inspiron 545 MT User Manual page 250

4 After ensuring that you are using the correct connectors on the back of the
TV and the computer, reconnect the video cable to the computer and the
TV.
5 Turn on the TV and the computer.
The TV should be shown as a display device on the Display Properties menu.
TV Resolution is Blurry
Use the control panel for the video card vendor to set the display resolution.
This method provides the best coordination for video card and TV display
resolution.
TV Colors are not True
Use the control panel for the video card vendor to adjust color settings. This
method provides the best coordination for video card and TV display.
Use this same control panel to adjust display resolution.
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Connecting Your Computer to a TV and Adjusting Display Settings