Chosen Solution
2015 MacBook Air. Wiped the drive and booted to recovery mode to install new OS. No Hard drive found. Boot into Target Disk and hard drive is there and I can erase and install an OS. Still not hard drive found when I boot to the Air. I have done PRAM reset and SMC. Nothing. Cannot boot into Safe Mode or Single User. I have unseated and reseated the drive. Completely baffled at this point. Any ideas would be great. Just don’t know what to start replacing at this point. Thanks, Debbie Update (08/31/2022) booted from external USB. No internal Drive shows at all in Disk Utility Update (08/31/2022) Original HD. I don’t get why I can see the drive in Target Disk mode but not interallly @danj
You’ll need to setup an external OS installer drive to fix the internal. Get a 32GB USB thumb drive using another Mac system format the drive the GUID and a journaled file system then install Sierra onto it (later you can upgrade) Go to here to get it How to get old versions of macOS and follow this guide to How to create a bootable installer for macOS to set it up. Once done use it to boot up under it reformat your internal drive using the Installers Disk Utility. Then install the OS. Once done you should be able to boot up. Lets us know once you’ve gotten that far.
