If I installed LINUX Mint, and later want to return to MacOS, how do I get my Macbook Pro to respond to the key sequences?
I installed LINUX Mint, on an older Macbook Pro 2011, just to see how it would run LINUX. EVERY PC runs LINUX, regardless of how old, and does it well. This one was dog slow, and the screen kept going off, and ... ugggh! It's not worth it! I was going to experiment to see what it would be like running macOS in a virtual session on LINUX. But, according to the license agreement, it HAS TO BE on Mac hardware. Well, this experiment went belly up!
Anyway, now in trying to install from the Network, the key sequences don't respond. So, I created a USB boot drive to install macOS El Capitan ... no response to key sequences again, nor would it book up!
HELP!!!