Half-performing Time-Machine can mess things up pretty badly (you don't need to be being told this, you're living it). I think it's time to start thinking about data recovery at this point. No CoreStorage logical volume groups found The terminal outputs of diskutil list, diskutil cs list, gpt -r show disk0/disk1: -bash-3.2# diskutil listĢ: Apple_HFS Mac OS X Base System 1.2 GB disk1s2 I tried to reset the SMC (unplug the iMac from power for 15 seconds) and it changed nothing. If you have questions, don't hesitate to ask. I really appreciate every bit of help or information, that could help me. I'm really desperate right now, because I didn't had a very good mood when I came home and now the day is totally trash. I also tried booting while holding the 'D' key to enter Apple Hardware Test, but the result was, that everything is okay. It also is not shown in 'diskutil list' and not shown in Parted Magic. The SSD is visible in Disk Utility, but not the HDD. I don't remember 100% exactly how everything happened, but the end result now is, that I do not see the HDD of my Fusion Drive CoreStorage. After TM failed the first attempt (Shut down at 20%) I tried again, but somehow everything got fucked up. After googling and seeing, that the login keychain was missing in 'Keychain Access', I decided to restore my Time Machine Backup from the evening before. After rebooting everything seemed normal, but there was this error, that the keychain login couldn't be accessed. I pressed the power button until it shut down (or crashed.) and rebooted it. So I arrived home from school today and wanted to use my iMac, but somehow it wouldn't react.

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