Unfortunately, missus thinks I am setting her up for new gear purchase since our wedding anniversary is approaching in 6 weeks.
Well, in that case I think your A900 has been hosed so you have no choice but to get something new.
Seriously though, I hope it sorts itself out. The only time I have ever come close to having a dead or broken camera was in 1995. I was wading in the ocean offshore of a tiny uninhabited island north of New Guinea -- you could walk all around it in about 10 minutes. Spent the night there sleeping on the beach. Anyway, I was wading out into the water with my Minolta Alpha 707si. I was trying to time waves so that I could squat down with the lens just barely above the water and get a wide angle shot looking back at the island. While I was squatting down a rogue wave washed over me and I was underwater. I quickly raised the camera over my head while I was still under, but it still had been submerged for a couple of seconds, I guess. I got out of the water and the camera was dead.
Fortunately, the next day was the end of my month in Irian Jaya aka West Papua New Guinea. I had no fresh water or anything to clean the camera with so I just dried the outside with a t-shirt and figured my camera was a goner. The next day I turned it on just to check and it seemed to work fine! I used that camera for the next few years and never had a single problem with it. I still have it. I hope your A900 will start working again too.
Oh, here is the island as we approached on the outrigger:
And me on the beach at sunset (by this time my 707si was dead):