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Various reset methods
Authored by: tak on Sep 05, '09 02:28:10PM
The incantation is different from mac to mac. Sometimes it's reboot while holding down cmd-opt-P-R. For the last couple years, it's been power-off, remove battery if it's a laptop, then hold down the power button for 5 seconds.
Clarification: Command, Option, P, and R for resetting PRAM and NVRAM works on all Macs: 68k, PowerPC, and Intel

Removing the battery and holding down the power button for 5s resets the SMC but it only works on some specific machines. And it should not be done arbitrarily regardless what Mac we are talking about.
How to and when to reset the SMC/PMU on Macs of this decade is explained here:

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