|The TV must be set to the right video source.|
E.g. PC or VGA
DO NOT plug in or unplug the VGA cable into / from a video port while the computer is running. Doing so can damage the TV's circuits and/or the video adapter's circuits.
See the TV's manual regarding the Resolutions you can use in Windows (or whatever operating system) for the display on the TV - usually setting it to the highest resolution possible produces the best resulting display on the TV.
The video output from the computer via the VGA port to the TV must be enabled.
There are two ways of doing that with a laptop.
If the display on the TV does not automatically work....
1. There is usually a key combo, Fn + F(some_number) - that toggles the display to built in display only / sometimes external video only / sometimes both. See the Owner's or User's manual for your specific model if you need to.
2.This works on any computer in Windows XP (or 2000).
RIGHT click on a blank part of the main desktop screen, choose Properties, then Settings.
Hold your cursor over the two display icons, one at a time.
One will show Not Active.
RIGHT click on that display, select Attached, click on OK at the bottom of the Display Properties window.
To set the Resolution for the display on the TV display, you must click on the display icon for the TV's display BEFORE you do that.
Windows will then keep the TV display enabled as long as the cable between the computer and the TV is still connected while Windows is running, but if you disconnect the cable and then load Windows at least once with it disconnected, you may need to enable the TV's display again after you have re-connected the cable.