Lightning struck my house through the internet cable and damaged several devices, including the modem, home alarm, and gaming PC. The PC no longer powers on. A large repair chain said the motherboard would need to be replaced just to test whether the system could start, at a cost of about $450, with no guarantee that the rest of the hardware survived. It has an RTX 4070 Ti and a good processor, so I'd like to recover whatever I can instead of replacing the whole system. What's the most economical way to diagnose the damage, and which components are most likely to be salvageable?
5 Answers
Ask the repair shop to leave the system disassembled if it can’t be repaired. The storage drive may still be readable, and you can recover files with the appropriate USB adapter or external enclosure. Also check whether your homeowners or renters insurance covers surge damage before paying for replacement parts.
Lightning damage is unpredictable, and even a computer that comes back to life may develop problems later. I’ve seen systems work for months after a surge and then fail as damaged components deteriorated. Have the shop test everything thoroughly before spending money on a full rebuild.
If you have a friend with a compatible working PC, you could test the components one at a time, starting with a known-good power supply. Don’t keep repeatedly trying to power on the damaged system, since a failed power supply or board could damage parts that survived the original surge.
Take it to a reputable independent computer repair shop rather than committing to an expensive motherboard replacement immediately. They can test it with a known-good power supply and motherboard, then check whether the CPU, graphics card, memory, and storage still work. The power supply is a strong suspect because it may have absorbed the surge, but lightning damage can sometimes spread to several components.
It was a Gold-rated power supply in a CyberPower prebuilt. I’m hoping it protected at least some of the expensive parts.
A proper parts-swap diagnosis is the practical approach. The motherboard and power supply may both be dead, but saving the RTX 4070 Ti, processor, RAM, or storage could make rebuilding much cheaper. A shop with test hardware can check those parts individually instead of guessing.
I was hoping to revive it so I could pass it down to my oldest kid, but I may have to accept that replacing the system is safer than trusting lightning-damaged parts.