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When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
My iMac won't restart with option option key held down so I can switch start-up disk to open Windows 10. It just goes black.
Trying to start up in target mode (holding T key down) just gave a black screen then a strange lightning flash icon moving like a screen saver.
Windows, Windows 6
Spoke to Apple - sounds like another Catalina problem. I am running macOS 10.15.1 on a late 2014 iMac. Unmounting and unplugging external drives including my TimeMachine disk solved the problem. A bit of a nuisance to have to do that every time though!
Spoke to Apple - sounds like another Catalina problem. I am running macOS 10.15.1 on a late 2014 iMac. Unmounting and unplugging external drives including my TimeMachine disk solved the problem. A bit of a nuisance to have to do that every time though!
restart
