Macbook Air is not starting up,only a colored circle hanging on the screen

I shoutdown my macbook air and close but only this time when i open, i first seen on the gray color screen a colored circle standy by and i tried to press the start up button but it didn't work to open the display on its main screen and  still only the colored circle stand- by remain the same. Is anybody could help me please to solve this issue?What should i do to make it work and back to its normal function?.

Best action to take is to take the computer to the Apple store or
Apple Authorized Service Provider to have the computer checked out.
Best.

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