Hi! I have the following setup: Late 2012 (new 2013) iMac. Startup disk is a Samsung EVO SSD 500 GB in a Delock enclosure (externally powered), connected to the iMac via Thunderbolt. The disk is less than 3 years old. Power indicator is on, so it's not a power connection issue. Internal 2 GB HDD, used for storage and files that don't need quick access. I don't think the HDD has a partition that's bootable, but I'm not quite sure. I have updated Time Machine backups of both disks. I have an external disk with a (not so fresh) clone of both the startup disk and the internal disk. I think it's USB 3, and I think it's bootable. Used Carbon Copy Cloner to make it Today, when i started the iMac, the "gear" icon was spinning forever. No login window. I restarted (holding the power button), and voila: the flashing folder icon, with a question mark. I assume this means the startup disk wasn't found. Tried the following: Hold Shift during startup for Safe Mode: did not work. Only got to the flashing folder/question mark Hold Cmd+R: this works. I get to a menu with options for Time Machine recovery, OSX install, Help/Support and finally Disk Utility. Tried to open Disk Utility - I can only see the internal HDD and in addition some small partition (1.19 GB) called "OSX Home..." or something like that. Verified both without issues. I do not see the SSD. So, the question is: 1: I assume the SSD is dead. Is this reasonable to assume? How can i verify it? 2: I have a complete and up-to-date Time Machine backup, but I can't start up from it, right? 3: I guess I could start up from the internal disk - but how (with my setup)? Do I need to delete everything on it first? 4: My guess is that I will have to get a new SSD, install it into the enclosure, format to Mac OS extended journalled, and then recover backup. And then continue as I have done for the last 3 years. Other suggestions or comments? Thanks a lot in advance!!