Device stalls at Choose Startup Disk - no options provided, spins
At power on, system chimes, logo briefly appears, then Choose Startup Disk. Select the system you want to use to start your computer has no options. Spinning circle, Restart button grayed out. Also does not recognize bluetooth mouse. Using plugged in keyboard. Tried commands and power up options with no difference. Will not enter any type of recovery. Keyboard worked initially to select language. Thought of installing new HD but see that is not an option. Am I left with a brick?