I purchased a 27" i7 iMac from the Apple refurbished store last week. Shipping time was great - the iMac actually arrived on Tuesday the 16th. I have not had a chance to really get it set up until today... Unboxed - everything looked amazing. No scratches. Nothing out of the ordinary. It is a truly beautiful machine. I have been using the Magic Mouse for a while - but the tiny keyboard is awesome. Started it up - as soon as the desktop popped up --- fans buzzed like crazy. It sounded like my old air hockey table. I shut down. Did all the resets, PRAM, etc. Still sounds like it is ready to fly off my table. Installed the little fan doohickies -- it says my CPU fan is spinning at 3955 RPM and the temp is 70 degree F. I ran the Apple Hardware Test -- error found. I called Apple. They were incredibly helpful and eager to assist. The nice young man on the phone went through several more tests with me. He gave me two options - take this machine to my local store or have them send me out another machine. Since I had barely even booted the machine up before the fans started buzzing like a jet plane - I elected a new machine. Looking through the machine, it appears that it only came with 4 Gigs Ram and the 1 TB drive. I was hoping to be one of the lucky ones who got the memory/HD upgrade surprise. Oh well. On the bright side -- it does look like my machine had a great screen. I could not see any yellow effects -- not enough that it would have caused me concern, anyway. I will look forward to the next machine.