Hi, I have a 27" 2011 iMac with serial a number ending in DHJW which I have found out is among some being recalled for GPU issues: http://support.apple.com/kb/TS5167 I have just experienced these exact issues but unfortunately I am not sure how to back up my hard drive before sending it off! I did have an external drive I was backing up onto but I had to order a new one because it had developed a fault - talk about bad timing! 1. Do I have any options for backing up before I sent it off? As far as I know filesharing and screensharing are switched off. Preferably I'd like to back the whole drive up with carbon copy cloner, but failing that just backing up the most important files would do. 2. Will apple supply a box? I don't have the original and roughly how long would it take to fix? Thanks for any help.. Forgot to note that the screen is now totally black on startup so obviously I can't do anything without logging in remotely..?