What is the Hard Reset Buttons Combo for Macbook pro

I have done it before but have forgotten.  I think it is Shift+option+commaand and hold down the power button for 5 seconds, all while the computer is off and plugged in, but I can't remember.
Any help is much appreciated

Hi B,
I believe you mean an SMC reset: http://support.apple.com/kb/HT3964
Note that it's different for different machines.

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