I am having a rather big problem. I have a iMac 2012 with a fusion hard drive. When I boot up the iMac it plays the chime but then loads straight to OS X Utilities. I am then given the 4 options pictured. I have tried everything. This problem occured when recently (since Monday after I installed a OS X update) when I have gone to shut down my computer, it closes all open apps but then just sits there, forcing me to press and hold the power button to power off. This was getting annoying so today I decided I would try to restore from a Time Machine back up. I went to restore and it failed. I then went to reinstall OS X and realised that Machintosh HD is no longer even listed. (It is also no longer listed when selecting a drive to restore a time machine back up to). Weirdly, bootcamp running Windows 8 on the iMac seems to be working fine and I am writting this now on there. I have attached some pictures to show more of what I mean as I may not be explaining myself correctly. I should add that bootcamp is a partition of my Machintosh HD so it makes me think (and hope) that the Hard Drive is not completely dead?