I recently purchased and returned two and seen one other 20 inch cinema displays with dead pixels.
Is this common on Apple LCD monitors?
Usually you can detect dead pixels better if you have a black background.
In severe cases, you can see plainly on your screen with desktop picture.
(you can quickly make your screen black if you go to Screen Effects and select Picture Folder and press test (OSX) - NOTE: if you have any pictures selected, this will not work.)
Is this common on Apple LCD monitors?
Usually you can detect dead pixels better if you have a black background.
In severe cases, you can see plainly on your screen with desktop picture.
(you can quickly make your screen black if you go to Screen Effects and select Picture Folder and press test (OSX) - NOTE: if you have any pictures selected, this will not work.)