I can't turn off my macbook air.

I am experiencing the same issue. I was a 'genius' a few years ago, so much for that moniker. Computer had "issues" (won't start) to begin with so source of my problem may be different from the rest. Computer was plugged in to power adapter as it was dead, it started up (played start chime) after 10 min of charging. Screen was black. Plugged in external monitor. Flashing folder. Held down power button over 30 sec, just to be sure. Tried CMD CTRL ALT Power, 30 seconds. Plugged in external keyboard, tried eject button for 30 sec and cmd ctrl alt eject. No success. Going to let it run out of power then restart with bootable Lion install on USB. Unfortunately I don't know what OS is installed currently, nor do I have a Thunderbolt cable or thunderbolt ethernet adapter.

Hold the power button down until the screen turns black.

In the future, make sure and quit all open applications before shutting down your Mac.

Hold the power button down for 10 seconds or more.

I had the same problem. Computer froze up. This happened numerous times. I took to Apple Store and they replaced.

Iam not able to turn off the unit.....lite is on n no key I press will work.....help

I did ....it won't work....

I did, does not works