sell on trademe might get a 10k for it
SepticSceptic: A water bubble or moisture spreading in thru a tiny crack or pinhole?
We have a winner .. or close enough.
Pictures asap, but long story short, Tiny ferrous filing or similar on the back of the monitor inside the housing.
"line" of rust allowing the damp into the backlight/lcd panel with the smallest of holes.
Live and learn.