This morning I awakened my computer from sleep to see a notice that Time Machine needed to redo the backup for my iMac (2012 edition). I told it to start a new backup. Safari crashed as I was surfing the web (which it's done for the past few days), and I went to repair permissions. For some reason I clicked verify disk, which advised me of errors. So I stopped the TM backup and rebooted the computer to repair the disk. I was told the disk was unrepairable and to reinstall OS X after reformatting the SSD (768 SSD). Now the computer won't boot at all. It shows a progress bar at the bottom of the screen but the computer turns off when it gets halfway. I've reset the VRAM, SMC, tried booting into safe mode, etc. to no avail. I looked on my NAS with my laptop to find that the TM backup is only partial. So therefore I'm screwed unless I dig out the previous Time Capsule and backup from that. Any suggestions to help fix this before I have to reinstall OS X with a USB flash drive? Should I look into getting the SSD repaired before doing this? This is not a great start to my Sunday morning!!