So I purchased a refurbished iMac a few weeks back and it arrived with a few scratches around the Apple logo. Apple accepted a return and sent me a new unit. Now after transferring all my files and using this new machine for a few days, I have noticed that there are a few imperfections INSIDE the glass (not behind the glass). It looks as though there is a pinprick sized imperfection in one place, and in another place there looks to be a speck of dirt INSIDE the glass. They can only be noticed on a white background. Is this worth sending the unit back for? Are these imperfections normal? What are the chances that my next unit is once again going to have an issue?