Well, I had a mura spot develop on my 10 month old 27inch iMac. So, I called apple care. They said it was a known issue and that the display needed to be replaced. I told them I would have to take a vacation day to go because the Apple store is two hours away. Scheduled the appointment. I got to the store and made the Genius go over every inch of the imac to see that it was mint (I baby my stuff). She commented how it was in excellent condition with no scratches dents...nothing, and showed me where she notated it. Verified the mura spot, and then I left. They said they had the display in stock and that it would take 3-4 days. About two hours after I got home, I received an email that it was ready. Took another vacation day, and went back this morning to get it. The stand was scratched pretty bad in several places. I pointed this out, and she went to the back. A few minutes later she emerged and said they did not have any stands in stock, but they could order it and replace it. I said that i needed my mac back up and running, so I will just deal with it...I can't keep taking vacation days and then take repeated 4 hour round trips. I asked if they would fire it up so I could verify that the screen was fixed. She told me that they couldn't and that they run diagnostics after all repairs and that it passed. Not being a really confrontational person, I said okay and packed it up and took it home. Got home, unpacked it, plugged it up and turned it on. It made the startup sound but the display remained black as in a power off state. About 30 seconds in, the fans start running a super high RPM's!!! I couldn't believe it. Called the store and asked for a manager. They had me perform a SMC reset, but that did nothing. Now I have to take another vacation day, and drive over tomorrow to drop it off again, and then of course go back when it is repaired. This time i will make them fire it up to verify everything is good, but damn am I ever frustrated.