How did you manage to get your imac up and running again? I only get an image of a lock, or the apple with the twirling circle. Tried all the suggestions, but can't even get my disk drive to read the original disk. I've tried 3 different keyboards to no avail!!! It sounds as if an Open Firmware Password has been enabled. Did this happen?
Jon
macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365
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