Hello all. first of all sorry for my english because I'm from Russia. I planned to buy a iMac but met on the internet many words about the problems with the display (yellow, flickering, etc.). Tell me please, these problems still remain, or the last delivery is normal? In Russia, I pay for my iMac 27, i7, 8GB about $ 4000 so I was very concerned about the problems with the display. Thank you.