Mac Book Air stuck on Apple logo at start up

The support article you came here from should provide you with the steps needed to try to resolve this issue. Have you tried them all yet? If so, and they didn't help, I suggest that you contact Apple Support directly. To do so, simply select the "Get Support" link in the upper right-hand side of this forum's web page.

You may also find the following support article helpful:

• If your Mac doesn't start up all the way - Apple Support