Record USB-C charging
For an apparent lack of power response.
MacBook Air · M1 (2020)
Where does startup stop?
Write down the last screen you actually saw, then choose the matching record. Keep “not visible” separate from “not attempted”.
Stop for liquid exposure, swelling, damaged power accessories or unusual heat. This route does not ask you to erase storage, reinstall macOS or open the laptop.
Fill in the worksheet in a text editor or print it. Use a task below for a saved, exportable record.
Choose by what you can observe
Confirm MacBook Air with the M1 chip, released in 2020. If the model or chip is uncertain, use Identify your device before following a task.
| What you observed | Record to use |
|---|---|
| No response to power is apparent | Start with the USB-C charging record. Do not infer that a black display proves a power failure. |
| The built-in screen stays blank or stops during startup | Record the last visible stage in the blank-screen task. Note whether startup options were visible, unavailable or not attempted. |
| The built-in screen works; the connected display does not | Use the external-display record. Keep the cable, adapter and display input beside the result. |
| You can reach startup options and want to compare startup software behavior | Use the safe-mode comparison. Record whether the same symptom occurs in normal and safe startup. |
| You want to record a hardware diagnostic result | Use Apple Diagnostics. Keep the installed macOS branch and the actual result together. |
Keep the two startup tools distinct
For Apple silicon, safe mode uses the startup volume and Shift with Continue in Safe Mode. Apple Diagnostics uses Command-D from startup options. Open the matching task for the full sequence.
Diagnostics in macOS Tahoe 26 and later asks you to select a test; earlier versions run automatically. An unavailable screen is an unperformed check, not a passed diagnostic.
A changed symptom in safe mode or on another display is a comparison result. It does not by itself establish which component needs replacement.
Choose your next step
Record the last visible screen
For a blank or stalled built-in display.
Compare the external display
For the connected screen when the built-in display works.
Compare safe and normal startup
For a startup-software comparison you can safely reach.
Record Apple Diagnostics
For the actual diagnostic path and result.
Build a startup service handoff
Combine saved records, unknowns and backup readiness.
Official guidance
- Apple: If your Mac starts up to a blank screen
A startup blank screen, an apparent power issue and an external display case need different routes.
- Apple: Start up your Mac in safe mode
Safe mode helps compare symptoms associated with software loaded at startup.
- Apple: Use Apple Diagnostics to test your Mac
Apple silicon entry and diagnostic screens depend on the device and macOS version.
Checked 17 October 2026. This worksheet organizes observations; it does not certify a repair.