My 27 inch Imac that is less than 1 1/2 years old has been to the Genius bar 4 times now without properly being fixed!! I have a Grey Screen that just stays stagnate. They have attempted several fixes, but tonight occurred again. Very frustrated!! This has been within a three week period for repairs and still cannot get right. Scheduling Genius appt after genius appt is ridicules at this point. When does it become a lemon