The computer has been sitting in my trunk, drying out. I brought it back in today. I tried to boot it up - and it DID! Now, I have ZERO battery, so it didn't stay up long. I've let it sign off and now it's charging.
If it boots up this weekend, it's coming upstairs and ALL FILES will be offloaded. Immediately!
My goodness, it's possible that we have dodged a bullet.
I've learned my lessons. (1) No beverages near my computer and (2) back up every week, at least.