Pattern to record: Plastic is browned or the plug becomes hot during workload.

Mains and connector safety

Shut the PC down and disconnect mains power if safe when the CPU power connector browns or overheats. Do not touch a hot plug or run a processor stress test to reproduce the symptom. Keep the PSU enclosure closed; PCIe and CPU cables are not interchangeable.

Identify the supply and load

The EPS/CPU connector feeds the motherboard’s processor regulators. Verify the cable against the PSU and board documentation; a PCIe graphics cable is not interchangeable just because a similar plug appears to fit. One possible explanation is that poor contact has created local resistance at a high-current plug.

Workshop checks

1. A technician should inspect the CPU power cable and motherboard socket with power isolated, checking both mating contacts, board damage, short circuits and loose retention.
2. Verify the EPS/CPU cable against the exact PSU and motherboard documentation before replacement. Inspect the processor-regulator input path without energising a visibly damaged connection.

Repair and loaded verification

Replace heat-damaged mating parts or assemblies as the model requires and correct the cause of poor contact. A burnt plug must not be reused with a new socket. Powered diagnosis is a professional step only after unpowered checks and any necessary repairs have established that it is safe. Using appropriate test equipment and the correct power supply, a qualified technician can then verify cold POST, processor load, sleep, restart and connector temperature. Stop the test if abnormal heating returns.

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