HT5781 Occasionally does not start when I open or press the on switch

Sometimes I appear to have no power and blank screen when i open my macbookair, and nothing happens when i press the power switch.. any suggestions?

open from what, off , or from sleep mode?
SMC reset and verify again
SMC reset
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer.
Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.
if same contact Apple for appt for free diagnostic evaluation of your Air.

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HT5781 Occasionally does not start when I open or press the on switch

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