How can I connect a laptop computer to a TV screen
You need to ensure that you have the proper connections to do this. The proper connection includes an S-video connection cable. This is the easiest to use when making the connection. Find more details from the following site http://www.ehow.com/how_2090653_connect-pc-laptop-tv.html.
With a hdmi cable
DVI cable output is on most laptops. HDMI is on newer ones. Your monitor most likely uses DVI which has a bunch of pins and connects to any computer. https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcRZBwQFqMUMI6IZ5wMYR-Zy1AbyG6Gou3O6yXxUEC9MBW_ifFAJ
Buy a HDMI cable, usually like 15$. Connect it from your laptop to the back of your TV screen. Be sure to see if you have the HDMI port on both devices.