Macbook air starts up but do not run.

it stays with the apple logo on the screen and is procesing, but nothing happens.
What do I do ?

There are a number of possible reasons your Mac isn't starting up. Firstly, if you have anything connected to it, unplug everything (except the power adapter) and try starting up again.
Assuming that doesn't help, or you have no devices connected to it, make sure it is fully shut down and then reboot. Immediately you hear the startup chime, hold down the shift key. Keep the shift key down until the Apple logo appears. This is an attempt to boot into Safe mode, which (like the Windows equivalent) means the system will try and load just the core components of the operating system necessary for it to run. This will tell us whether the problem is relatively simple, such as a driver which the system can't load or doesn't understand (in which case the system should boot into Safe mode) or if there is something a little more serious that has gone wrong, such as  badly corrupted MacOS, or a RAM or drive fault (in which case Safe mode won't work either).
Let us know how you get on with that, and it may also help us to know a little more about your system, such as which model it is, which version of MacOS it is running and whether you have had any other problems with it before this current issue.

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