Pattern to record: The adapter protection trips immediately when connected to the computer.

Identify the input design

This guide applies to an all-in-one with an external low-voltage adapter. An all-in-one with a mains lead entering the chassis has a different power arrangement; identify the model before selecting an adapter or opening the display. One possible explanation is that a damaged filtering capacitor pulls the main input rail toward ground.

Stop before further damage

All-in-one units may also contain mains-powered sections that require trained handling. Repeatedly reconnecting the adapter can worsen board damage.

Workshop checks

1. Verify the specified adapter, inspect the input socket and compare behaviour at minimum and normal load.
2. Measure rail resistance with power removed and isolate the shorted section methodically.

Repair and power verification

If the checks support this cause, replace the confirmed failed capacitor and inspect nearby components for heat stress. Verification should cover cold start, display brightness, processor load, sleep and repeated restarts.

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