Hard to say, but from the picture, it looks like the green panel has possibly moved (I'm assuming LCD from the image).
If not, what does it look like that with no inputs attached? I've seen some projectors do strange things when they have some leads attached without them being attached to a source, i.e the dvd player lead is attached to the pj, but is disconnected from the player. Make sure all leads are attached at both ends or not at all. With no leads attached, does the image still look like the pic?
What does it look like when playing a dvd or image from a pc? Are all sources affected?
Did the power go off when it was last used, so the unit had to cool down without the fan dunning?
Hopefully we'll be able to see if it's a simple fault or not from your answers. I take it it's almost unwatchable due to the fault you mention?
Gary.