Reviving a PC caught in flood
If your PC gets caught in a flood, you might imagine it is impossible to retrieve the motherboard anymore. But luckily, once floods occur, an automatic power outage ensues, so there is hope you can still save your PC.
The immediate solution here, upon salvaging your desktop PC from the water, is to remove the CMOS battery immediately. Next, guided by the motherboard manual, open the apparatus and expose the inner part then with a clean dry rag, wipe off the water and dirt. Rinse the components using distilled water and dab them dry with soft cloth. Leave to dry for several hours or until you are sure everything is dry. You can then reassemble the device, install a new battery and proceed to test.