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Key combinations to troubleshoot your Intel-based Mac at start-up

Many articles you read on Mac troubleshooting mention troubleshooting methods like resetting the NVRAM, starting in FireWire Target Disk Mode, starting in Safe Mode, or starting in Single-User Mode, but fail to explain exactly how to do that.

By February 25, 2010

Article

Leopard Graphics Update 1.0 (#3): Zap NVRAM/PRAM for numerous issues; freezes

More fixes for this surprisingly problematic update.

By February 19, 2008

Article

Thawing some deep freezes: Zapping PRAM/NVRAM

Zapping PRAM/NVRAM has only a few uses and this is one of them.

By July 17, 2007

Article

When to reset the PRAM and SMC/PMU

The PRAM The Parameter RAM is a small amount of "nonvolatile" RAM (NVRAM) that holds various settings that the system can use before the operating system loads, and maintains these settings even when the computer is turned off. There is a small battery

By April 9, 2009

Article

Margin Note: Why are three chimes recommended for a PRAM/NVRAM reset?

Margin Note: Why are three chimes recommended for a PRAM/NVRAM reset?

By July 18, 2006

Article

Troubleshooting Mac OS X 10.2.4: Resetting NVRAM for sleep problems

Troubleshooting Mac OS X 10.2.4: Resetting NVRAM for sleep problems

By March 5, 2003