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Damn, that sucks. I know you say it hasn't gotten wet or dropped, but does anyone else have access to your equipment, I can't think of anything else that would cause this. Maybe extreme temp changes? Good luck and keep us posted.
I don't know what's with me lately. I miss complete sentences, and my grammar and punctuation is going from excellent to bad. Must be a hitting 50 thing.
I've seen the effect on a notebook LCD, turned out the notebook had been dropped and a tiny little cable (that appeared to be fully inserted into it's tiny PCB connector, was a smidgeon loose.
I'd send it in to get it looked at and serviced.