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

Don’t turn it on until every component is completely dry. Take the system apart, place the parts on an antistatic surface, and use gentle airflow. Because water can leave behind minerals and other conductive residue, clean any affected boards with high-purity isopropyl alcohol and let them dry again. You may need to replace thermal paste on the CPU and GPU afterward. There’s no guarantee, but a powered-off system has a much better chance than one that was running during the leak.

Condensation water may be relatively low in minerals, but you shouldn’t assume it was pure or residue-free after passing through an air conditioner and sitting inside the case. The motherboard, RAM, and GPU might survive if they were unpowered, while parts with trapped moisture or residue are more concerning. Clean and dry everything thoroughly, then test components gradually rather than reconnecting the entire system at once.

After cleaning and drying, inspect the boards closely for corrosion or residue around connectors and chips. If you have valuable hardware, consider having a repair shop test it instead of taking the first-power-on risk yourself. Document the damage and keep the parts for the insurance claim; don’t dispose of anything until the insurer tells you what they need.

The power supply is the part I’d be most cautious about. If water reached it, replacing it is safer than trying to test it in the computer. Don’t open the PSU yourself. A damaged PSU can fail violently or send bad voltage to the other parts, so have it professionally checked or replace it before testing the rest of the system.