ralphbrau wrote:
BINGO! The cable restored access! Many thanks!
Next question: Is this likely to be a "one off" event, or does it indicate a developing failure of some kind? (I keep TimeMachine backups, but they are encrypted and may not be useful if the iMac fails.)
🤷♀️ Bluetooth, Wi-Fi, and keyboards can all have transient glitches, and old iMacs can develop less-than-transient hardware issues.
I usually run with the Apple recharge wireless keyboards and trackpads wired. I have the USB ports available, and don’t mind the wires.
Time Machine backups should be fine for recovery, so long as you remember the password. Enabling iCloud Keychain or using Keychain secure notes or other such can help, there.
I usually run parallel TM archives, as TM does occasionally glitch, HDDs can fail, and the power can drop out at an inopportune moment, etc.