I bought a prebuilt gaming desktop about two or three years ago and don't know much about its internal components. It has an Intel Core i7-14700F, GeForce RTX 4060, 32GB of DDR5 memory, and a 1TB NVMe SSD. I used it heavily for several months at a time, then left it unused for long periods. It has accumulated dust, and I've only cleaned it twice using canned air without fully removing the components. A few weeks ago, I smelled burning rubber and noticed smoke coming from the computer, so I unplugged it and waited for the smell to disappear. Nothing looks obviously melted or burned. I'm outside the original warranty and want to know whether it's worth inspecting and repairing the machine, or whether I should scrap it and build a new PC. I'm also not sure whether removing components such as the graphics card could damage anything else.
4 Answers
The power supply is one of the most likely causes, and a burning smell or smoke is a serious warning sign. Never open the power supply itself because it can retain dangerous voltage even when unplugged. Check whether the system is still covered by a store warranty or protection plan, and otherwise consider replacing the PSU with a reputable unit of the same or greater wattage. Document where each cable is connected before removing anything.
Don’t power it on indoors again. Unplug it, open the case, and inspect it only in a safe, nonflammable area with a fire extinguisher nearby. You can remove the graphics card and other components without causing the remaining parts to smoke, as long as the system is completely disconnected from power and you handle everything carefully. If you can’t identify the source, have a technician or experienced builder inspect it.
Dust alone doesn’t usually explain active smoke, though it can contribute to overheating. The RTX 4060 does not use the high-power connector associated with some newer graphics cards, so that particular issue is unlikely here. Focus on the power supply, cable connections, and any area showing melted insulation or darkened plastic.
A new case won’t necessarily solve the problem. The damaged part could be the power supply, a cable, the motherboard, or a connector, so replacing random wiring and then testing everything could risk the other components. Since the machine smoked, the safest approach is to leave it unplugged until the faulty part is identified. If you don’t feel comfortable diagnosing it, giving it to an experienced friend or paying for an inspection is safer than guessing.
Even if the computer was only cleaned with air, inspect both ends of every power cable for looseness, discoloration, melted plastic, or scorch marks—especially the motherboard and graphics-card connections.