Laptop screen on t.v

1. you should use your TV remote to change signal source to S video or whatever port you use
2. you should make sure that video output to external monitor (TV in this case) is enabled on your laptop.

to check it go to control panel, display, properties. settings.
you should choose multiple outputs (TV is not grayed out), then click on second display (TV) and set proper resolution. there is also a checkmark to "extend windows desktop onto this monitor".
if you want that to be your primary display, check the other mark but beware that it may be tricky to switch it back to laptop display as primary if you don't have the tv with you to see what are you clicking on.

btw. not sure what kind of performance you expect from external display. intel graphic was always poor performer. i have dell workstation with dedicated video card and i'm not too impressed with S video (HD is another story)