Desktop POST Hardware System: open circuit or connection. A pin, trace, socket or component no longer carries its required signal.

The distinguishing clue

One rail or channel is absent while neighbouring stages work.

Checks before an assessment

Record the exact POST light, beep or code and the motherboard model. Check the monitor input externally; do not treat a diagnostic light as proof that a named part is defective.

Stop point: Repeated part swapping with power connected can damage components.

Workshop confirmation and repair

Device-level check: Record codes and test minimum known-good hardware in a fixed order.

Targeted check: Trace continuity and signal progression with power isolated where required. If confirmed: Repair the open path and its mechanical or thermal cause.

Repair boundary: Repair the confirmed memory, graphics, processor, firmware or board stage.

Related cause to rule out

When the fault changes with temperature or chassis flex, also consider Desktop POST Hardware System: intermittent solder joint before choosing a repair.

Checks after the work

After repair or replacement, check cold boot, diagnostic indicators, full detection, restart and sleep.

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