red color cast on a 23" cinema display!!!

just bought a used 23" cinema display. It came with a reddish color cast. So i complained to the seller who shipped another one... with the same color cast! I live in 2 different locations, i already use that same screen in one location, this is for the 2nd location. My other display don't have that color cast, i use it with my macbook pro. SO WHAT THIS RED COLOR CAST MEANS? AN ALMOST DEAD SCREEN? note: the color cast start 4mm from the edge (so there is a kind of white frame) and is not uniform; more reddish on the edge, less in the center. Calibration won't help. Thanks