hi. got the first screen flickering after 2 weeks of use on my imac 27. also updated firmware 2 days ago. just right now the screen black out completely. i guess apple has one more frustated costumer... also have yellow tinge but i didnt care about that problem that much i guess i will prepare an exchange request Edit: Maybe this is caused in low brightness? now that i think i changed yesterday the brightness almost to the middle. i have 6 bars on the right left. never happened with brightness more up. i will test it a bit more. what is the brightness level you use?