CMD+OPTN+P+R, hold after turning Mac on. Keep holding until Mac has chimed a minimum of three times, then let go for a normal boot. Then try what you're trying again.
I found the problem, was the keyboard, I forgot that I replaced it with an older model 2002, a friend gives me one from 2005 and is working with ALT and C key.
I found the problem, was the keyboard, I forgot that I replaced it with an older model 2002, a friend gives me one from 2005 and is working with ALT and C key.