Reset, Flash Macbook PRAM & NVRAM

Parameter random access memory (PRAM) is the volatile memory where temporary data gets stored while running programs and nonvolatile RAM (NVRAM) is the main on board memory on which the data remains even after restart macintosh computers.

Please Note: If your computer does not retain parameter RAM (PRAM) settings when it is turned off, this generally indicates that the battery needs to be changed.

Today we will tell you how to reset PRAM & NVRAM on powerbook, macbook or ibook computers.

Resetting PRAM and NVRAM

1. Shut down the computer.

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.

3. Turn on the computer.

4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.

5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.

6. Release the keys.

Your computer’s PRAM and the NVRAM are reset to the default values. The clock settings may be reset to a default date on some models.

Contents Of PRAM gets reset after resetting PRAM

  • 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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