Can Anyone Explain This 20" ACD Problem?

This is my third ACD 20" after I returned the first two because of backlight and other serious problems. I've been using it for almost 2 months now and last night I suddenly realized that the display had developed four dead pixels. One of them is like a 1mm diagonal line. All of them dark. Dead pixels at the time of manufacturing is acceptable but what about those which are born after careful usage under normal conditions in a home. Will there be more subsequently? Should I return this display too?

I would get a replacement display since it's still under warranty. Pixels may die with age, but shouldn't be as bad as you're describing.

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