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 it is safe to do so. Do not touch a hot connector or run another workload to reproduce the fault. Do not open the PSU enclosure: hazardous energy can remain after unplugging.

Identify the supply and load

An ATX power supply provides several outputs and startup signals. Document the PSU model and connected loads; a spinning fan or a simple unloaded start test does not establish stable operation under load. One possible explanation is that poor contact has created local resistance at a high-current plug.

Workshop checks

1. A technician should start with an unpowered inspection of both mating connectors, their cable and the board socket, following the system’s service procedure. Check heat damage, shorts and the source of looseness.
2. Identify the supply model and exact cable compatibility before any substitution; modular PSU cables are not interchangeable merely because they fit. Record the installed loads without powering the suspect 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 start, processor and graphics load, sleep, restart, connector temperature and all required power connections. Stop the test if abnormal heating returns.

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