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could be a number of things including the power block faulty, a break in the power lead, the power regulator in the macbook or even it's just plain old dead. if the macbook lights come on when it's plugged in and nothing else happens when you press the power button, odds on it's just dead.
i will try opening the macbook clean it with air compress can and then try restarting it see what happens then your screens may be going bad. may need replaced.
Your MacBook air has an ambient light sensor that is right next to the iSight camera. You can turn the brightness up or down from the keyboard (F5 and F6). You can also turn this off completely from system preferences. Go to the Apple menu > system preferences > keyboard
Leave the Macbook air turned on until the battery goes dead. Then Connect to power and start it up. That should solve the problem. You problem was caused by not letting an update install in full.
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