There appears to be some kind of problem during the boot process, where the
system may be looking for a network system to boot from; however this is not
certain and just a guess. If your MacBook/Air is stuck on that screen, you may
force shut down the computer by holding power key for 15+ seconds. ~ Then
try a restart method using • How to reset NVRAM on your Mac - Apple Support
This ^ could be tried more than once, because all keys need to be held properly
and let go correctly. The Mac can be let chime three times before they're let go.
Another startup item to try, is to hold Opt key to see if you could get your Mac
to look for another startup disc; perhaps it lost its way and cannot find the HDD
where the internal system lives. Or, that system (or hard drive) has issues.
• Use safe mode to isolate issues with your Mac - Apple Support
Another item, with the computer shut down, is a restart in Safe mode. You'd have
to wait awhile and eventually hope to sign-in (admin password) to get Safe boot
and then you may use the regular Disk Utility to repair disk permissions, or look
around (it will try to repair the system somewhat by simply using Safe mode) then
to get out of Safe mode, you simply (try) a normal re-start.
• Reset the System Management Controller (SMC) on your Mac - Apple Support
{If those have been tried, and nothing happened... consider contacting Apple service
be that an Authorized independent provider, or an Apple Store/genius appointment.}
How to use macOS Recovery. Hold down Command-R on your keyboard immediately
after pressing the power button to turn on your Mac, or immediately after your ...
//support.apple.com/en-us/HT201314
Have you tried booting in Recovery on start? You may be able to force quit by
holding the power key down for more than 15 seconds. Then on re-start hold
the recovery shortcut keys to begin startup from the built-in recovery partition.
{Two different 'sets of keys' can be employed for either Recovery startup mode,
one uses localized 'recovery partition' in the Mac's hard drive. The other uses an
online 'internet recovery' this could take much longer to access. ~ If you get to an
indication of a system screen for Recovery, or macOS Utilities, this is a good start.}
Was there anything else going on before the MacBook/Air showed this screen?
Do you have any USB3.0 or other peripheral connections attached to the Mac?
Been awhile since you posted the image with message; and I've found nothing
like it online, even by use of 'image search' in google. ~ Perhaps nobody has
posted a like image, or just maybe the search engines don't like 'helping' us...
Hopefully someone whose actual or other experience has seen this & knows
how to get past it, will offer their ideas on how to recover from this. And what
you may have going on in your MacBook Air + macOS X that caused it. The
globe icon usually implies a network outside the Mac. This may imply an error
in finding an internal system. -- Or a hardware failure that would need a repair.
There may be a terminal command to reboot, if you could start in single-user
or other command-line access and enter the proper code. I've seldom ever
used the underpinnings of OS X to resolve issues; haven't needed to so far.
Sorry to not so helpful...
Good luck & happy trails! 🙂
