How to Reset an EFI Chip (8 Steps)

Shut down the computer.
Turn on the computer and immediately hold down the 'Command,' 'Option,' 'P' and 'R' keys at the same time.
Release the keys after you hear the computer beep a second time.
Check to see if the computer is operating properly. If not, continue through the next steps.
Reboot the computer and hold down the 'Command,' 'Option,' 'O' and 'F' keys at the same time during startup.
Wait until you see the message 'To continue booting, type 'mac-boot' and press return.' If the message does not appear, try starting the computer by holding down the power button continuously until the message appears.
Type 'reset-nvram' and press 'Return.'
Type 'reset-all' and press 'Return.'
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