Hi, you must have missed my post.
I'm reasonably sure the screen is burnt and exibits that grey/bluish look.
In old technology screens with blue, green, red colored screen pixels, if you continued to use one part of the screen alot it burnt or flared that part of the screen (that's why they had those screen saver programs that moved the scanning electron beam randomly around the screen).
I just saw this greyish screen yesterday on a wheel alignment screen and remembered back to monitors at the TV broadcast stations having test patterns burnt into the screen. So the problem will just keep slowely getting worse. Increase the font intensity and size and decrease the contrast is the way to go.