LCD display does not work

The display in any mode shows only a some a couple vertical and horizontal lines, a grey rectangle and a black rectangle. The camera DISP button changes only the intensity of this image if I hold it down for a couple of seconds. I can still take pictures by looking through the view finder and transferring them to my computer. However, I'm pretty much restricted to using AUTO mode, since I can't see changes to any settings.

I'm not sure if the problem has to do with moisture, since it cropped up suddenly on a foggy day, but the problem has not gone away with time, nor has it been intermittent.