My PC suddenly shut off while I was gaming, then the power supply made a loud pop and threw sparks. I immediately switched it off and unplugged everything. The surge protector did not trip, but the circuit breaker did. There is no obvious damage to the motherboard, graphics card, cables, or other visible components, and I cannot see any bulging or leaking capacitors. The power supply is an inexpensive DK Premium 850W unit rated C- by a PSU tier list, so I am concerned it may have failed catastrophically. The system uses a Ryzen 5 7500F, RX 9060 XT 16GB, 16GB of RAM, a 1TB NVMe SSD, six fans, and an unspecified CPU cooler. The PSU is under warranty, but returning it would involve expensive shipping and a long wait. Is there a safe way to determine whether the rest of the PC survived, or should I replace or return the PSU without trying to power the system on?
3 Answers
The breaker tripping while the surge protector stayed on is not automatically suspicious. A serious short inside the PSU can trip the household breaker without producing the kind of line-voltage surge that causes a surge protector to disconnect. In any case, a PSU that popped and released sparks should be considered unsafe and should never be powered again.
In many failures the PSU takes the damage by shorting internally, and the rest of the computer survives. I have seen systems work normally after only the power supply was replaced, but that is not something you can guarantee ahead of time. Returning this unit for a refund and buying a quality replacement is the safer choice, especially since it was already a poor match for a system with a modern graphics card.
There is no reliable way to know from visual inspection alone. Components can fail internally without scorch marks, and a motherboard has multiple internal layers that you cannot examine. Do not reuse that power supply or its modular cables. The safe approach is to replace or return it with a reputable, properly rated unit, then test the computer with the replacement. If you want to reduce risk, disconnect unnecessary drives and peripherals for the first test and stop immediately if you smell burning, hear arcing, or see anything unusual.
That was my hope too, since I cannot find any visible damage. I will treat the PSU as failed and avoid assuming the other parts are safe until I test them with a replacement.