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Did you have both the computer and the TV OFF when you connected the VGA cable ?
If you are getting no video from the computer on the TV......
You must select the right video input on the TV.
XP enables only one display by default.
The cable between the computer's video and the TV must be connected.
RIGHT click on a blank part of your desktop screen select Properties, then Settings.
Hold your cursor over the right display icon - number 2 - it probably says "Not Active".
RIGHT click on that display - select Attached.
Click on OK at the bottom of the Display Properties window to make the setting "stick".
READ the manual for the TV.
You have to set the Resolution in Windows for the display on the TV to one of certain specific resolutions at the same place.
Windows will retain the second display being enabled as long as the cable to the TV is still connected while Windows is running, but if you boot the computer with it disconnected at least once, you will have to enable the second display again when you do have the cable connected.
Some laptops will display on an external monitor without you having to do anything.
If you get no video on an external monitor, some laptops have a key combo that you must press to toggle the display to external video only / built in display video only / sometimes both - see the Owner's or User's manual for the model.