Asked on Super User by Pants Mookie, 3 years ago. No reply there for at least a week.
iMac does not respond to any key at boot
My iMac of late 2013 with a 3.1 GHz Quad-Core i7 processor and 16GB memory doesn't respond to any key combination during boot ! I have tried an old Mac USB keyboard as the usual keyboard is Bluetooth (both shown in the picture). I must mention that the iMac is running Big Sur, which doesn't officially support this old Mac, after an earlier successful patch following the instructions from this page . Any ideas as to what I can do? I can't even reinstall its original OS. I must - at least - start with cmd+R the recover page.
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iMac does not respond to any key at boot
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Question by Pants Mookie on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.