My PC suddenly lost power while I was gaming, then the power supply made a loud pop and threw sparks. I shut it off immediately, unplugged it, and found that the circuit breaker had tripped while my surge protector had not. The power supply is a low-quality DK Premium 850W unit, rated C- on a PSU tier list, and it is still under warranty. I would prefer not to spend around $50 shipping it back and wait for a refund if only the PSU failed, but I also don't want to risk the rest of the system or create a safety hazard. I can't see any obvious damage to the motherboard, cables, or other components, and there are no visibly bulging or leaking capacitors. The system uses a Ryzen 5 7500F, RX 9060 XT 16GB, 16GB RAM, a 1TB NVMe SSD, six fans, and an unspecified CPU cooler. Can I safely test it, and what should I do next?
3 Answers
The only practical test is to install a new, reputable, correctly sized PSU and check the system carefully. Components can fail internally without scorch marks, bulging capacitors, or other visible signs, especially since motherboards have multiple internal layers. Make sure none of the old modular PSU cables are reused with the replacement unit; use only the cables that come with the new PSU.
Do not use that power supply again, even briefly. A breaker tripping means the electrical fault was large enough to trip the circuit protection, while the surge protector may not have detected the type of fault involved. The PSU should be returned or replaced under warranty. There is no reliable way to know whether other components survived just by looking at them.
In many cases, a failed PSU is the only damaged part and the computer works normally after replacement, but that is not something you can assume beforehand. Since this unit popped and produced sparks, prioritize safety and pursue a refund or warranty replacement rather than gambling on it. Inspect the motherboard connectors and GPU power connectors for melting or discoloration before connecting a new PSU.
It sounded like a loud pop followed by sparks, so I’m going to treat the PSU as completely unsafe and check the connectors before trying a replacement.
So the breaker tripping does not necessarily mean there was a power surge from the wall—it could simply have been the PSU shorting internally?