![]() ![]() There may have been another way, but I couldn't figure it out. I then had to open the iMac again, swap the SSD for the HDD again, and then I could do a fresh install. ![]() To install High Sierra on the third-party SSD, I had to open the iMac again, put an OEM Apple HDD back, install an OS before high Sierra, then upgrade to High Sierra, installing the Firmware in the process. I forget the exact message, or if there even was one, but I think I wasn't even able to start the install process because the SSD showed as greyed out on the installer when picking the installation drive. The issue appeared when I went to do a clean install of High Sierra on the new SSD. I swapped with a third-party SSD and cloned the OS from another Mac I had and was running High Sierra on it just fine. The reason why is because I pulled a failing HDD from the Mac that only had Yosemite installed. I could install earlier OS versions, but not High Sierra. I have personally had a firmware issue on an iMac that prevented me from installing High Sierra to an non-Apple SSD. If you are having a problem with a specific application, you can learn how to uninstall programs from your Mac here.Click to expand.I don't know why either, maybe there was a problem updating the firmware. Installing a fresh copy or reinstalling the operating of your Mac is an easy process, as long as you are connected to the internet and your computer is plugged into a power source. Skip creating a new account if you are selling or giving away your device. Process is complete, your Mac will restart. Click the button, and the process will start. If you are in the functioning recovery partition when you booted, you will see the Reinstall macOS option. Once your data is wiped, you can then start the reinstallation process.This process will take a few hours, so make sure that your Mac is plugged in. This step will start the process of wiping your Mac’s hard drive. Select Erase by the bottom right corner of the screen. ![]() Most older computers will be Journaled, while most modern laptops that come with solid-state drives (SSD) are APFS-formatted. The Disk Utility will show the compatible format by default.
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