You can't connect a standard TV to a computer using a VGA cable. If you have it, use the composite (yellow) RCA jack or S-Video from your laptop. As for turning off a laptop monitor, look on the function keys for LCD/CRT or icon for monitor (typically 3, 5, 7, or 8) hold down FN key and press the correct function key.
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You should be able to connect the LCD monitor providing your laptop has got a VGA connector to allow this, then you will need to change your display settings depending on whether you want the same desktop on both monitors or whether you want to extend your laptop desktop on to the second monitor.
maybe a short circut happened and fried your monitor's decoding unit... There probably is nothing you can do to fix it and you can't really do anything with it other than trashing or potentially expermenting with the thing, but bewarned, It may jump back to your laptop...
Make sure the external VGA port on your laptop is enabled. Not all laptops automatically detect a monitor connected and turn on the port. There will be a function key somewhere on the keyboard to control the port. Location varies by manufacturer and model. The usual sequence when you press the key is: laptop display on and external VGA off, laptop off and VGA on, both on.
You would have to allow the laptop to use the tv as a external monitor. simply right click on your desktop click properties in their just have a look around and it will show 2 monitors allow the tv as one
This problem is most likely to be caused by a bent or broken pin on the CRT video cable at the VGA connector, OR, this could also be caused by a damaged VGA connector on the back of the laptop.
If neither VGA connector is at fault, the problem could be caused a damaged (kinked) CRT data cable, or internal damage to the VGA connector on the back of the laptop, though I suspect the problem is more likely to be external, and you probably won't have to disassemble the laptop to locate the culprit...