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Helpful answers
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Feb 20, 2012 6:52 AM in response to RayFmMDby John Galt,I am far from certain but I believe it is the power management unit (PMU) reset switch a/k/a Cuda switch: http://support.apple.com/kb/HT1939
Do not press it when the computer is on.
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Feb 20, 2012 7:11 AM in response to John Galtby RayFmMD,John, the alternate power button is also used to reset the SMU. I have already pressed the other button once but it doesn't seem to do anything, so I am still wondering.