I built a secondary PC in 2020 with a Ryzen 5 3600, Gigabyte A320M-H motherboard, Cooler Master 650W 230V PSU, and later added an RTX 4060. After moving to a location with 110V power, the system would not start. I bought an ASUS TUF 750W Gold PSU and tried installing it, but the PC still showed no lights or signs of life. I initially connected the 24-pin cable incorrectly: the PSU-side end was connected to the motherboard and vice versa. After rearranging it, I tried again with the GPU and RAM removed. The PSU clicked, the fan started, and I saw flames coming from the motherboard's 24-pin connector. There was also a strange smell. What most likely caused the fire—the PSU, the cable installation, or the motherboard? Could the CPU, GPU, RAM, or other components also have been damaged?
4 Answers
The original 230V-only PSU would not be suitable for a 110V outlet unless it specifically supports 110–240V input. However, that does not explain reversing the ends of the new modular cable. Before installing another PSU, verify the input-voltage rating and use only the cables supplied with that exact unit.
Do not power this system on again. The modular 24-pin cable has a specific motherboard end and PSU end, even if both connectors seem to fit. Reversing or forcing the cable can put the wrong voltages on the motherboard and cause the connector or wiring to overheat and burn. Also, modular PSU cables should only be used with the PSU they came with, because their pinouts are not standardized.
The likely cause is the incorrectly connected 24-pin cable rather than simply using 110V power. The new PSU should normally accept the local voltage if its label says 100–240V, but the cable must be installed exactly as marked. A burned connector means the motherboard, cable, and PSU need to be treated as damaged until tested or replaced. Do not reuse the burned cable or PSU.
Other components may have survived if the PSU’s protection circuits shut it down quickly, but there is no safe way to assume that. The CPU, RAM, GPU, storage drives, and motherboard should be inspected and tested with known-good parts by a repair technician. At minimum, replace the motherboard and the damaged PSU cable, and closely inspect the PSU connector for melted plastic or carbon damage.
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