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However, the replacement SSD has the same issues.. one would never know the SSD was replaced. It makes no sense.. Any ideas?? Update (10/25/2019) Hi Dan - After I found I had the same issues regardless of which SSD was installed, I was perusing the Apple Community Discussions and believe the issue isn’t either SSD’s. The problem is some system disk images that were created a year ago after I installed High Sierra from a thumb drive. After the installation it left a macOs Install data file that I didn’t see. I just discovered that mac’s are designed to maintain disk image files irrespective of a SSD. I spent a lot of time trying to figure out how to delete a system disk image via terminal…. I came to the conclusion it is either not possible or requires an understanding of terminal use that is beyond me. If I am wrong, please let me know!! Thank you very much.
Try to check you’r BIOS settings if its up date you’ll need to upgrade from Apple or Intel depend on you’r model if its not the BIOS updating then something in you’r system or hardware non functioning right. basically it should be a quick software install. reboot and check again .
Sounds like we need to nuke the drive! And rebuild it. First step here is you need a working external bootable drive ideally macOS Sierra (10.12.x) Here’s the needed steps to create the needed OS installer How to create a bootable macOS Sierra installer drive With a bootable drive you should be able to boot up under it. Restart your system and hold the Option key to gain access to the Startup Manager. Select your USB OS installer drive, then from the menu run Disk Utility and delete all of the partitions and reformat the drive to GUID Journaled file system. Then run the OS installer from the USB drive to install the OS. During the install process a fresh recovery partition will be created. Apple let its certificates to expire so you’ll need to get a fresh Installer from Apple How to upgrade to macOS Sierra Jump down to Step 4 to get to the needed URL link.
