Hello, The problem is now solved. Immediately after powering on the iMac I press and hold the option key for about 30 seconds and then arrow left to select the time machine disk as the startup volume and press Enter. I then wait about 2 minutes and then type the encryption password for that disk. I do not start VVoiceOver. My iMac has an SSD and so makes no disk reading noise to show that it is doing something, but as I wear hearing aids I can set one of the them to induction loop mode and can then hear electronic noise whose pattern tells me that the iMac is waiting for keyboard input of the encryption password, and when I have entered that the electronic noise changes to tell me that the iMac is booting. Alternatively I can touch the time machine disk to feel whether it is waiting or reading data. A short time later I hear my normal logon screen. I have also learnt that I must use time machine preferences to turn off automatic backup before doing a SuperDuper backup to the time machine disk. Failure to do this may result in a boot from the time machine disk trying to do a time machine backup to the same time machine disk which causes an apparent hang after normal login. Best regards…..
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