Startup and power symptoms

No response, intermittent startup and random shutdowns have many possible causes, including the internal power supply and the logic board. Tell us the exact sequence, whether it changed after a power cut or update, and which accessories were connected.

iMac display and Mac mini monitor behaviour

For an iMac, tell us whether the panel shows lines, dark areas, flicker or no picture at all. For a Mac mini, we need to separate "no picture" from "not booting" — mention what monitor and cable you used.

Storage and performance warnings

If the Mac became very slow, showed a storage warning or stopped booting, protect important data before troubleshooting further. Don't erase a Mac with critical files until we've talked about data priorities.

Drop-off checklist

Bring the Mac with its power cable, plus any keyboard, mouse or display adapter involved in the fault, and a short note of the original problem.