My late 2012 iMac has some weird screen burn in in the bottom corners, looks like smoke...weird. Since i bought the iMac less than a year ago its still under warranty and apple plans on replacing the screen. I have backed up the drive and installed a fresh 10.10.3 just to be safe. My only concern is if i should remove the extra ram i had installed, has anyone had issues with applecare and owner installed ram? The apple tech said they hope to be able to replace the screen within a few days, if not make sure to have a backup in case they replace the whole iMac. Thoughts?