I've had my titanium powerbook for a bit and its practically in pristine condition. However, lately the screen has been acting up and it makes a hissing sound. The screen seems to degauss/staticky, to the point where I can't see a thing unless it occassionally stops and clears up. I now have to hook it up to an external display and the screen (external) works perfectly normal. The screen is not marked at all and does not have any dead pixels or white spots that I know of. I have no idea what to do

, help will be much appreciated.
josh