My desktop stopped booting after I accidentally spilled beer over the top of it while gaming. I unplugged the power almost immediately, but the screen had already gone black. The system has a Ryzen 9 3000-series CPU, 32 GB of Corsair DDR4 across four sticks, a Gigabyte RTX 3070, an MSI MPG B550 Gaming Carbon WiFi motherboard, and a be quiet! 700W S9 power supply.
The motherboard's DRAM debug light stays on. After switching off the PSU, the DRAM light goes out and the CPU light briefly comes on before everything shuts down. When I try starting it again, the CPU light flashes for less than a second, then the DRAM light comes on and remains lit. The case power button also stopped responding, even when held down.
I cleaned the system and left it to dry overnight. I also tried clearing the BIOS, but that did not initially help. I'm unsure whether the motherboard, GPU, CPU, memory, or case power switch was damaged. I don't have spare parts available to test the CPU or GPU, so I'd like to know what troubleshooting steps to try before buying a replacement motherboard.
3 Answers
The debug LEDs only show where the startup process stopped; a DRAM light does not automatically mean every memory stick is damaged. Once the power switch issue is ruled out, test with one RAM module at a time in the recommended slot, reseat the GPU and power cables, and clear CMOS properly. If it eventually boots, back up important data and inspect it carefully for lingering liquid damage.
Beer can short components and leave conductive residue, so drying overnight may not be enough. Completely unplug the system, remove the GPU and memory, and inspect the motherboard, connectors, and case wiring for sticky residue or corrosion. Clean affected areas with high-percentage isopropyl alcohol and let everything dry thoroughly before testing again. Avoid repeatedly powering it on while liquid or residue may still be present.
Since the spill landed on top of the case, the physical power button or its wiring may have been affected. Disconnect the case power-switch connector from the motherboard and briefly short the two power-switch pins with a screwdriver to start the PC. If it starts that way, the button or cable is likely the issue rather than the CPU or GPU.
After disconnecting the power-button cable and starting the system by shorting the pins, it began working again. Reconnecting the button afterward also seemed to restore normal operation.