Pattern to record: The desktop remains unresponsive with its normal power connection.

Use the correct Mac power design

Identify the Mac mini generation and its specified power connection. Recent models use a mains lead; older designs may use an external supply. The USB-C ports are not a substitute for the desktop’s power input. Recent Mac mini models receive mains power through their power inlet; older models must be matched to their documented external supply.

Power and data precautions

Mains-powered supplies contain hazardous sections and retained charge. A USB-C laptop charger does not replace this desktop’s specified power connection.

Model-specific checks

1. Verify the model-specific power lead or external supply, then separate power, startup and display-output stages.
2. Identify the model, inspect the specified power lead or adapter and compare a working outlet before internal diagnosis.

Repair and startup verification

If the checks support this cause, replace a proven defective, model-compatible lead or supply; if input power is correct, continue to startup and display diagnosis. Verification should cover cold and warm start, all display outputs, USB load, sleep and sustained operation.

Reference: Apple support guidance; Apple support guidance.

For an assessment of your Mac mini, contact AEPC in Burswood or call 027 908 8880. Provide the model and the conditions that reproduce this problem. Workshop visits are by appointment.