[cd34]

The odd thing is, burnin used to be a problem with the phosphors on the glass. LCD shouldn't have that. Though, there are TVs that do LCD to a phosphor, however, I really doubt that is what you have. I think what you might have is what is considered persistence.

An all white image displayed for a long time probably will get rid of it. It is funny that black, the absence of light is what caused your line. Or is it the edge of the 4:3 that actually is the burned in portion?

The only reason I can think an Apple could be more susceptible to this is that they really were the first to bundle LCDs rather than CRTs. Though, I have had laptops that have had burnin before screensavers were commonplace -- Pre windows, when you had a login screen.