Mac SMC Reset: Something That Might Help if Your MacBook Air Does Not Boot

I had a bit of scare while trying to download the iOS 4.2 update for my iPad yesterday. The MacBook Air I was using to get the update crashed during the long download process and would not turn back on. After fussing a bit with the Air’s power button, I was just about to make an appointment at a nearby Apple Store Genius Bar when I remembered that Macs have a couple of keyboard gymnastics that can force a boot. Here’s the Apple Support item I found that helped me in my situation.

Intel-based Macs: Resetting the System Management Controller (SMC) (Apple Support Knowledge Base)

The instructions I followed were for MacBook models that do not have a removeable battery (most models from 2009 onward):

1. Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
2. On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
3. Release all the keys and the power button at the same time.
4. Press the power button to turn on the computer. Note: The LED on the MagSafe power adapter does not change states or temporarily turn-off when you reset the SMC.