An easy way to tell the difference between LCD and plasma screens is that plasma screens have a glass pane across the face of them, and LCDs don't. So if you can see your reflection in it, then you have a plasma screen.

Also, don't play games on a plasma screen, ever.

Quote Originally Posted by Yamaneko
If it sticks out considerably in the back then it's a CRT, otherwise LCD.
It could be a rear-projection.