Unable to Choose a Startup Disk After Attempting a Factory Reset
My daughter attempted to factory reset her fairly-new MacBook Air. Somehow things have hung up at the "Choose Startup Disk" dialog window. The system is unable to find *any* startup disk. I have tried starting up in Safe Mode, checking startup security settings, resetting the SMC, using Command-R, Option-Command-R, Option-Shift-Command-R, etc., and in every case, all the device ever shows is the "Choose Startup Disk" window without showing me any startup disk to select. The little "whirly-gig" icon just keeps going round and round. Have we "bricked" this Mac or is there a way to rescue and resuscitate it?