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Resetting your Mac's PRAM and NVRAM

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http://alex-v.com » Resetting your Mac's PRAM and NVRAM

Alex Voinich


If your Mac starts up from a startup disk other than the one you’ve specified in Startup Disk preferences, or if a “question mark” icon appears briefly when your Mac starts up, resetting NVRAM / PRAM may help

Reset NVRAM if your computer has any problem with:

  • Speaker volume
  • Screen resolution
  • Startup disk selection
  • Recent kernel panic information

To reset your computer’s NVRAM: follow this steps:

To reset your computer’s NVRAM:

  • Locate the following keys: Command, Option, P, and R.
  • Press and hold the Command-Option-P-R keys during startup
  • Continue holding the keys down until the computer restarts, and you hear the startup sound for the second time.

 

 

 

Related Articles
Summary

Learn about your Mac’s PRAM or NVRAM, and when and how you might want to reset it.
Products Affected
Desktop Computers, Mac OS X 10.4, Mac OS X 10.5, Mac OS X 10.6, Mac notebooks, OS X Lion, OS X Mountain Lion

Your Mac stores certain settings in a special memory area even if it is turned off. On Intel-based Macs, this is stored in memory known as NVRAM; on PowerPC-based Macs, this is stored in memory known as PRAM.

Information stored in NVRAM / PRAM includes:
  • Speaker volume
  • Screen resolution
  • Startup disk selection
  • Recent kernel panic information, if any.

 

About the Author

Alex VoinichI'm a webmaster and front-end web developer. I live in Phoenix, Arizona, USA during the summer, and in Pattaya, Thailand during the winter. Be free to ask me a question about any topic found on this server.View all posts by Alex Voinich →

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