so this morning, the Mid 2011 21.5" iMac (2.7Ghz i5 and 1TB HDD) started to make clicking noises when it was switched off (maybe it trying to make a time machine backup) and when I woke it from sleep to check it, apps were not responding suddenly. Couldn't do anything so it was restarted, and when booting up it shows the folder symbol with the question mark. When loading into internet recovery, it cannot find the HDD in either disk utility or in the Boot Disk screen. So it is clear the the Drive has suddenly failed, what are the next steps here? How much do Apple charge for the HDD replacement (purchased 2 and a half years ago)? Will it be under that recall of Seagate HDDs? Anyone been in this situation before? Really appreciate any and all help here guys.