projector picture shows only half

Sounds like a bad screen inside, these projectors run of a tiny little pc screen with a massive light behind them and a lens in-front, sounds like the little screen is buggered and im afraid to get a replacement would cost more than a new projector.

Although it might be worth making sure that something hasn't come loose and is just sitting between the lens and the light, have a look in the lens WITH THE UNIT OFF so u don't blind yourself and see if it looks like something is blocking half of it.

Also the half that is not showing is it white or black?

Select 1024x768 resolution from your computer