![]() ![]() Then the circle with a line through it screen. Now it appears to be a constant problem booting from either drive.Ĭomputer starts and reaches the user login screen.Īfter entering the password I get an apple with progress bar screen. This was after entering a user password at login. The second time the computer started up after installing the Supplemental Update 2 on both drives, the screen went to the "circle with a line through it" icon. Both the internal drive and the external drive have Catalina 10.15.7 installed and I boot from either depending on what software I want to run. MacOS Catalina 10.15.7 Supplemental Update 2 causes circle with a line through it I use a Mac Pro with an external SSD. Now despairing! Any suggestions much appreciated! Everything then works fine but if I shut down or restart I go back to square one and the machine boots from the Hard Disk once more. If I then plug in the SSD it appears as a startup option and if I select it the Mac finally boots up from the SSD. If I disconnect the SSD and restart holding down the ALT key the menu of startup options DOES appear. If I hold down the ALT key on startup the usual menu of startup disk options doesn't appear and the machine continues to boot into High Sierra on the Hard Disk. I have also reset the PRAM and SMS but to no avail. I have tried restoring both the Hard Disk and the SSD from Time Machine backups. In the startup preferences the SSD is shown as the boot disk but the machine will only boot from the Hard Disk. I run Catalina on the SSD but have kept High Sierra on the Hard Disk for occasional use with older applications.Īfter installing an Apple update this week – I think it was a security update my Mac will no longer boot from the SSD and reverts to booting from the Hard Disk. I found that the SSD gave hugely improved speed and performance. About the security content of macOS Catalina 10.15.7, Security Update 2020-005 High Sierra, Security Update 2020-005 Mojave.What's new in the updates for macOS Catalina: 10.15.7 at Apple.Some features may not be available for all regions, or on all Apple devices. Addresses a graphic issue that may occur on iMac (Retina 5K, 27-inch, 2020) with Radeon Pro 5700 XT.Fixes an issue that could prevent files syncing through iCloud Drive.Resolves an issue where macOS would not automatically connect to Wi-Fi networks.MacOS 10.15.7 is an update to macOS 10.15 (Catalina) that was released on Septemby Apple Inc. ![]()
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