Here are the steps to reset PRAM on your Mac:
1. Shut down your Mac.
2. Press the power button to turn on your Mac.
3. Immediately press and hold the Option, Command, P, and R keys on your keyboard. You need to press this key combination before the gray screen appears or it won’t work.
4. Hold down these keys for at least 20 seconds.
5. Release the keys.
6. Press the power button again to turn on your Mac.
I hope that helps! Let me know if you have any other questions.
