Desktop Motherboard Power System: heat-sensitive board component. Cooling, solder fatigue or internal degradation makes a board component unstable under load.

The distinguishing clue

Crashes appear at a repeatable temperature or workload.

Checks before an assessment

Describe no response, brief fan movement or repeated restarts separately. Do not open the PSU, bridge pins or reuse uncertain modular power cables.

Stop point: Power must be disconnected before moving cards or board connectors.

Workshop confirmation and repair

Device-level check: Compare a known power supply, inspect connectors and trace the board power sequence.

Targeted check: Log temperature, clock and power while testing cooling first. If confirmed: Repair cooling or replace the confirmed damaged component.

Repair boundary: Repair the confirmed connector, regulator, rail or downstream short.

Related cause to rule out

When the computer works at light load but becomes unstable as demand changes, also consider Desktop Power Cycling: Distinguish the PSU from Motherboard Power Faults before choosing a repair.

Checks after the work

After repair or replacement, check cold start, processor load, graphics load, standby and shutdown.

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