Water Leaked Into My PC While It Was Turned Off—Which Parts Might Survive?

Treat the power supply as the highest-risk part. Don’t open it or connect it to the rest of the computer just to see whether it works; replacement is usually safer and cheaper than risking every other component. After the system has been cleaned and thoroughly dried, test it with the replacement PSU and the minimum hardware needed to reach the firmware screen.

The RAM, storage drives, case fans, and some other parts may be fine if they weren’t directly soaked, but inspect them carefully for residue or corrosion. Document the damage and keep photos for the insurance claim. If the insurer replaces the system, ask how they want the original parts handled before trying to repair or reuse them.

Since the computer was off, there’s a reasonable chance that some or all of the parts survived. The bigger concern is residue left behind as the water dries, not just the water itself. Remove every affected component, disconnect or remove heatsinks where practical, and clean the boards with high-purity isopropyl alcohol. Let everything dry completely with good airflow for several days before reassembly. You may need to replace thermal paste afterward. There’s no guarantee, but cleaning gives the parts a much better chance than simply waiting for the water to evaporate.

Take the entire system apart and place the components on a nonconductive, static-safe surface with a fan moving air across them. Air-drying alone may not remove minerals or other contaminants, and air-conditioner runoff shouldn’t automatically be assumed to be perfectly pure or harmless. Avoid powering anything until you’re certain it is completely dry, including connectors and slots.