Motherboard Power System: shorted board rail. A capacitor or semiconductor pulls a supply toward ground.

The distinguishing clue

Current draw is abnormal and protection may stop startup.

Checks before an assessment

Record existing lights, sounds and the point where startup stops. Keep the device off if there is liquid exposure, burning smell or repeated protection shutdown.

Stop point: Random voltage injection can destroy connected chips and stored data.

Workshop confirmation and repair

Device-level check: Isolate loads and measure resistance, enable signals and voltage sequence with controlled equipment.

Targeted check: Isolate loads and locate the affected rail using controlled measurements. If confirmed: Replace the shorted component and verify resistance before power.

Repair boundary: Repair the confirmed short, open circuit, regulator or sequencing stage.

Related cause to rule out

When fans or lights start but the board never completes initialisation, also consider Motherboard Power System: incorrect power sequence before choosing a repair.

Checks after the work

After repair or replacement, check standby draw, startup sequence, full load and temperature.

For an AEPC repair assessment in East Auckland, provide the exact model and observed clue. Call 027 908 8880 before visiting the Burswood workshop.