So I have a Late 2009 21.5" iMac. On Sept. 12th I brought it in for repair because of a faulty display. Got it back on the 19th and brought it back in again the next day because the display was flickering and yellow tint on the bottom. Just got it back today and guess what? Yellow tint is still there. It's been in the Apple Store for 2 weeks, What should I do? It's already had 3 repairs now.