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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.
More fixes for this surprisingly problematic update.
Zapping PRAM/NVRAM has only a few uses and this is one of them.
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
Margin Note: Why are three chimes recommended for a PRAM/NVRAM reset?
Troubleshooting Mac OS X 10.2.4: Resetting NVRAM for sleep problems