Connecting my LCDTV upto my Computer

Once you connect LCD Monitor to your Laptop! I am assuming your referring to a laptop hookup! Most PC's come with a function key which is labeled FN on your Keyboard next to the Ctl key. It should be in blue Print! You should be able to depress that Key along with I believe F8. this will transfer the image on to your LCD Monitor.

Riziel is correct. On some laptops instead of F8 you need to press FN + F2. Just look for the F key with a picture of a monitor on it.
Make sure you adjust the resolution before you try to output to the LCD. I would reccomend setting resolution to 1024 x 768 as this works with just about any display. Once you have a picture you can then set to the native resoltion of your screen. i..e 720p will be 1280 x 720 or 1368 x 768. for 1080p screens the resolution should be 1920 x 1080