A 15 inch MacBook Air M3 that will not finish starting is a laptop, so rule out power before software. Look at the MagSafe light when the charger is connected: amber means it is charging, green means it is full, and no light at all means the cable, the adapter or the outlet has failed. An Air that sat in a bag for a week can be fully drained and needs about half an hour on charge before it responds at all.
The checks in more detail
If you have an iPhone, open Find My and see when the Air last checked in, which tells you whether it was running recently. The Touch ID button is also the power button, and pressing it for a second or two is enough to start; a long hold of about ten seconds with the charger attached forces a power reset that clears a hung state.
Take off any dock, display or drive attached to the two Thunderbolt ports, as one bad device can leave the Air at the logo. If the Air lights up and still stops, hold the Touch ID button after shutdown until the options window appears with a gear marked Options. Apple documents what the start-up screens show: a question mark on a folder, a prohibitory sign and a globe each point to a different cause.
From Options, open Disk Utility and run First Aid on the startup volume, then choose Reinstall macOS, which keeps your documents; Time Machine restores an older copy if you need one. If nothing happens when you hold the button, the firmware may need reviving with a second Mac and a USB-C cable using Apple Configurator, as Apple's guide explains. Keep the charger connected throughout a reinstall, since it takes a long time and a flat battery in the middle makes things worse. If the Air was wet, do not charge it; take it to an Apple Store.
Differential
Likely causes of “Apple MacBook Air 15-inch is stuck at startup, automatic repair or recovery”, and how to tell them apart
- 1
A drained battery after travel
What separates it The Air shows nothing at all
How to confirm Charge for half an hour, then retry
- 2
A failed update
What separates it The Apple logo and a progress bar that never finishes
How to confirm Reinstall macOS from Options
- 3
A damaged startup volume
What separates it A question mark folder
How to confirm Run First Aid in Disk Utility
- 4
A faulty hub on a Thunderbolt port
What separates it It stops after the logo
How to confirm Unplug accessories and displays
- 5
A Touch ID power button that is stuck
What separates it The Mac never responds
How to confirm Press and hold firmly for ten seconds
Before you touch a setting
Record this first — changing settings destroys the evidence
- The symbol shown on the Air
- The MagSafe light color
- Which accessories were attached
- Whether Find My shows it recently online
Try in this order
0 of 6 completedCharge the Air first
ReversibleMagSafe light amber, then green.
Hold the Touch ID button
ReversibleUntil Options appears.
Unplug accessories
ReversibleHubs and monitors.
Run First Aid
ReversibleOn the startup volume.
Reinstall macOS
ReversibleKeep your files.
Restore from backup
ReversibleIf needed.
Model-specific
What is true of this model and not of its siblings
- Apple silicon
- Recovery is a power hold.
- Revive
- Another Mac can restore the firmware.
Stop boundary
When this stops being a self-service repair
- !If Options never opens, an Apple revive is needed
- !If First Aid fails twice, back up and contact Apple Support
- !Check Find My before assuming a fault
Evidence ledger
Sources behind this answer
Exact questions
Common questions
How do I open Recovery on an M3 Air?+
Hold the Touch ID power button until Options appears.
Why does a traveled Air show nothing?+
The battery may have drained.
What does a question mark mean?+
No startup disk was found.
Can I check Find My?+
Yes, for its last check-in.