4/30/2023 0 Comments Late 2013 macbook pro ssdRun the installer (can be on the external drive you booted from or another external disk). If necessary, use Disk Utility to delete all partitions from the machine’s internal drive. Use your external drive as your startup disk. You can download your Mac’s OS installer (in my case High Sierra) from the Max App Store (or another official Apple site). I think my Time Machine disk for that machine was bootable but I don’t remember. You will need a bootable drive of some sort (actual hard drive or USB). Long long whole day story short: Some of this had to do with the switchover to APFS in High Sierra, which won’t apply to you but it might get you over the hump. I also couldn’t boot into Online Recovery Mode (or whatever it’s called). I could launch into Recovery Mode but trying to reinstall the OS failed near the end when it said it couldn’t partition the drive. After I nuked the drive with Disk Utility, I found I couldn’t boot the machine. I transferred the data to my new machine with Migration Assistant and I have a bootable clone of the hard drive. I recently finally replaced my 2009 iMac and wanted to wipe it clean. I ran into a similar solution just last week.
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