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Thanks. Tried that plus all the apple keyboard shortcuts I could find. Reset pram etc... no go. On either machine .... (thanks though)

Did this work?

I not only did this stupid mistake to my iMac but to a friends laptop 8( (boots to chimes exactly like yours, after trying to start the Mac off of the USB Sierra installer.) stupid me! Help! Is the reprogramming (etc) of the EEPROM or EFI my only solution!?! He needs his computer by morning...