OSX holding down "c" isn't starting computer from disk

[Jimmypoo]

I have trouble with that on older units.

Previously a USB MacAlly wouldn't do it for the Smurf.
I went back to an ADB keyboard in the Smurf - and that works...... sometimes.

Very frustrating when I have things I want to do.
And OPTION via ADB provides no choices.

I would imagine this is an even bigger problem with BT keyboards.
Where is the Bluetooth activation for keyboard commands
during start-up?

Perhaps in the ROM of the newest machines.......