It's more than likely to be a clear image. I've had to repair a few that have had their video leads worn.
It's not the most pleasant of job to do, you have to open the very thin display housing without breaking the bezel.
You could say it's a bit of an art to take apart and put together again.
Let us know how it goes.
Best of luck.
Hooked up to a display and got the same pattern overlay whether the displays were mirrored or not. Picture it as a series of vertical columns about 3/4" wide, made up of alternating light blue and clear bars about 2 mm thick. Every other column, the pattern reverses, so as you go across the screen, it's blue-clear-blue-clear ...
Oddly, the pattern doesn't show on the swirly blue screen saver.
In any event, it looks like time to break out the backup drive. I'm afraid this might be a more serious problem than I originally thought.