Repairing a persistent "Bad BIOS Checksum" Message

Recently, I revived a system which was submerged in flood due to the typhoon Ondoy. I cleaned the system using a dishwashing liquid and I was able to revive the system.



But upon checking the boot-up message at the BIOS start-up page, it always report that the BIOS checksum is bad. I even changed the CMOS battery and still no luck. I checked the voltage on the CMOS reset jumper (set at normal mode), and it reads 0V. On one of my normal mobo, there is a voltage of around 2.59V. With this, I decided to experiment a little bit.



The setup is :
+ Terminal of Battery ------ Diode (1N4148) ------ two terminals of the CMOS reset normal mode



And the problem was solved! :)