Keyboard and trackpad unresponsive after sleep

I've had this problem a few times since I got a refurbished MBA a few weeks ago.
In preferences, I have it set to require a password when waking up. Most of the time, this goes fine, but sometimes I get the login screen with my username and the cursor blinking in the password field, but there is no response when I touch the keyboard or try to use the trackpad. I try pressing every key and combination I can think of, including the Force Quit combo (cmd-opt-esc). Nothing.
It also sometimes just has a black screen, and again nothing I do causes any response. In those cases, if I close the lid and then reopen it after a few seconds, I get the login screen, but the keyboard and trackpad don't work.
The only solution has been to turn it off and on again with the power switch, which is obviously not the most efficient way to wake up a sleeping computer.
Any suggestions?

Try resetting your SMC and PRAM.
Resetting the System Management Controller >>
Dave M.
MacOSG Founder/Ambassador  An Apple User Group  iTunes: MacOSG Podcast
Macsimum News Associate Editor  Creator of 'Mac611 - Mobile Mac Support'

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Keyboard and trackpad unresponsive after sleep

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