How to Use Print Screen Function on Mac

Hold down Apple key ⌘ + Shift + 3 simultaneously to get a picture of your entire desktop. If your audio is turn on, you will hear a click similar to that of a camera. You will then find a picture on your desktop entitled 'Picture N' ,n being the first unused number.
Hold down Apple key ⌘ + Shift + 4 and release to capture a certain area of the screen. A cropping tool will appear and you can select the area of the screen you would like to capture.
To do a screen capture of a specific application window, Hold down Apple key ⌘ + Shift + 4 and release. Click the spacebar and a camera icon will appear. Move this icon to the application window you want to capture and press 'Enter.'
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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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