MacBook Pro - PRAM Reset

Please note that the function of performing a PRAM reset can fix many other things, even though they may not be directly listed in this article. It is a good idea that when performing a PRAM reset, an SMC reset is done at the same time. Click here for SMC reset instructions.

How to perform a PRAM reset:
Step 1. Shut down the computer.
Step 2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Step 3. Turn on the computer.
Step 4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Step 5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Step 6. Release the keys. Allow the computer to start up normally.

 
A PRAM reset restores these settings to default:

  • Status of AppleTalk
  • Serial Port Configuration and Port definition
  • Alarm clock setting
  • Application font
  • Serial printer location
  • Autokey rate
  • Autokey delay
  • Speaker volume
  • Attention (beep) sound
  • Double-click time
  • Caret blink time (insertion point rate)
  • Mouse scaling (mouse speed)
  • Startup disk
  • Menu blink count
  • Monitor depth
  • 32-bit addressing
  • Virtual memory
  • RAM disk
  • Disk cache
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