Hello, I'v got a MacBook Air, and it won't turn on as it goes: on, the Apple logo shows, the waiting wheel spins and then turns off again, and keep doing this till i shut it down for good... it won't turn on... help me please =(

Try:

1. Turn your MacBook Air off by holding down the power button for about 10 seconds.
2. Hold down one of the Shift keys and press the power button for a few seconds. Keep holding the shift key for about 1/2 minute. This will start the machine in "Safe Mode." It will check to make sure there are no errors on your hard drive and do other tasks to hopefully fix your problem.
3. Once you see your Desktop (if you do), click the Apple menu and click "Shutdown".
4. Start the computer normally by holding down the power button for a couple seconds.

If this doesn't work, you may need to reinstall the operating system. On a MacBook Air, that's a bit more complicated. You'll need either the external DVD drive (an optional purchase for the Air) or another computer. Your computer manual explains how to install software on that other computer (may or may not be necessary) so that you can use that computer's DVD drive to put the disc in and reinstall Mac OS X operating system.

Good luck! Please let us know if you have further questions or problems.

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To resolve this follow the given Below steps -First, Shut down the Mac >Then connect it to your MagSafe adapter >Hold down the Shift+Control+Option+Power button at the same time for a few seconds.> Now Release all keys at the same time, then boot the Mac as usual. if still, your MacBook Air Won't Turn On then visit - https://www.mactechnicalsupportnumbers.com/blog/fix-macbook-air-wont-turn-black-screen-problem/