Apple Diagnostics with the right macOS branch
Open task Capture an Apple silicon diagnostic result and identify exactly which tests ran.
Device evidence task · MacBook Air M1
Safe mode versus normal startup
Compare one repeatable symptom across verified safe mode and normal startup.
Planning estimate for recording observations; excludes charging, backups, drying and service. Not a measured repair time.
Confirm the exact model
Enable JavaScript to record observations. The complete preparation guide is available below.
Preparation guide
Pick one harmless local action that exposes the symptom, such as opening the same document. Record its normal-startup result before changing mode. Skip an action that would risk unsaved data.
Source: Start up your Mac in safe mode · Purpose of safe mode; original comparison worksheet
Shut down completely. Hold power until startup options load, select the startup volume, then hold Shift and choose Continue in Safe Mode. This is the Apple silicon sequence.
Source: Start up your Mac in safe mode · Start up your Mac with Apple silicon in safe mode
Sign in using your own credential. Confirm Safe Boot at the login screen or inspect System Information → Software → Boot Mode. Record safe mode only when confirmed.
Source: Start up your Mac in safe mode · Verify your Mac started up in safe mode
Perform the same available action once. If the feature cannot be tested in safe mode, mark that condition Not applicable and retain the limitation instead of declaring success.
Source: Start up your Mac in safe mode · Safe mode purpose; original same-action comparison
Restart normally and compare that action again. Retain all three results for support; a difference suggests a startup-software lead without naming a particular app.
Source: Start up your Mac in safe mode · Safe mode purpose / Boot Mode Normal; original comparison worksheet
Check the result
- Safe mode is verified rather than assumed.
- The same action and unavailable features are recorded.
Stop conditions
- Stop using and charging equipment with swelling, casing separation, smoke, a burning smell or suspected battery damage. Do not open or press on it.
- Set damaged accessories aside. Do not open mains adapters or force connectors.
- Do not erase, reset, flash firmware or bypass a lock as a default diagnostic step.
Official sources and model fit
- Start up your Mac in safe mode
Apple silicon / Verify safe mode · Checked 2026-10-13
M1 power, startup volume, Shift + Continue in Safe Mode and Boot Mode verification
Reference only. Original paraphrase and observation worksheets; no copied images or manual pages. - Important safety information for your Mac
Handling / Built-in battery / Charging · Checked 2026-10-13
General damaged-equipment and moisture safety only; M1-specific connections are sourced from mac-spec
Reference only. Original paraphrase and observation worksheets; no copied images or manual pages. - Identify MacBook Air model
Find model / MacBook Air M1 2020 · Checked 2026-10-04
Model and chip confirmation
Reference only. Original paraphrase; no copied images or manual pages. - MacBook Air (M1, 2020) technical specifications
Charging and Expansion / Display Support · Checked 2026-10-13
Two USB-C Thunderbolt/USB4 ports and one native external display up to 6K at 60 Hz
Reference only. Original paraphrase and observation worksheets; no copied images or manual pages. - Use Apple Diagnostics to test your Mac
Prepare / Apple silicon / Run Apple Diagnostics / Results · Checked 2026-10-13
M1 Options then Command-D; Tahoe 26+ selected tests versus earlier automatic testing; preserve reference code
Reference only. Original paraphrase and observation worksheets; no copied images or manual pages.
Original preparation workflow based on the linked documents. No hands-on device repair testing is claimed.