I bought a new 11 inch Air a few months ago, and found a friend to buy my old Rev A (1.8, 64 GB SSD). The fan was making weird noises, so my son and I brought it down to our local Apple Store to see if we could get the fan checked out. The "genius" at the bar ran a "proprietary" hardware check program on the Air, and said the fan was OK, but the hard disk was failing. I asked how could a SSD fail like this (I never heard of it, nor have I ever heard of a hardware test program being able to pick it up). He said "it happens" but said that there was an 80 GB disk in the back that they could install that day for $149. I said "never heard of an 80 GB SSD, nor of an SSD that cheap," and asked to open the box the "SSD" came in. At that point he said "oops, it is a regular HD," and it would cost $749 to replace the SSD. My son and I left that Apple store as quickly as possible. What is wrong with Geniuses? Are they not training them properly? I probably need to just take off the back cover and blow the accumulated dust out of the fan.