I took my 840av apart.
nothing noticable wrong with it.
so I washed the motherboard. I used the shower. Then I used water from our dryer. This is suitable for using irons. The mobo will now dry out for a week in the airing cupbord.
wish me luck!
Quadra 840av, prettymuchmaxedout8xcd drive,3 monitors 15" & 14" & 14" os 8.1
Powerbook Duo 280c, 12 meg ram, 500 meg hard drive