hi. so i the 8th of february i got my imac 27 core 2 duo to an apple store for a screen replacement because of the yellow tinge. today i got a phone call telling me that the imac was ready. i got to the store and turned on the imac there in front of the apple genius, and for my shocking surprise the new display had a worse yellow tinge. i was horrified. so it went back for and second display replacement. nice apple, didn't even care to check if the new display was fine.