TV's gone wonky

So my TV has gone screwy all of a sudden.

It's a rear-projection flat screen job (Magnavox). About 4 years old (and I have to look it up, but I'm sure our warranty will wind up being for three years) and never had any problems with it.

But now I've got some random color separation. On the top and bottom of the screen you can see where the colors aren't lined up. There's a wavy green section pulled apart from the red section. The center of the screen is fine. So it is still watchable, but pretty annoying.

Anyone else have this happen? Assuming my warranty is up, what will this cost me to get fixed?