I have a less than a year old imac 27inch which has a failing hard drive - ive mad an appointment with genius bar to take a look at it at the Bluewater branch. Also, I have applecare on this imac. My problem is I need this Imac for work, so what is the likelihood of them being able to swap out the hard drive right away? or how long would this usually take? Also, would going to a bigger store like Covet Garden make getting a speedy repair more likely? Thanks All.