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If the button is sticking, here's a quick way to clean it - remove the batteries, then get a cotton swab (like a Q-tip) and soak it in Isopropyl Alcohol, then clean all around the button, letting some alcohol soak in around the button. Work the button up and down for about 20 seconds, then let it dry for a couple of hours. I try to use the 90% Isopropyl Alcohol, but lower will also work - you can get this at a drug store or at Wal-Mart. The alcohol won't damage anything, and the higher the percentage you buy, the faster it will evaporate.
Sounds like you have a shorted out circuit card. Try replacing the batteries first to see if the power returns to the keys. If that doesn't work, you will find it cheaper to find a replacement calculator vs sending it to an authorized factory repair center. Hope this helps.
Sounds like a possible short to me, But I don't have experience with that cause I have yet to test my calc with water if you know what I mean... The one thing that I can suggest is trying to connect with another persons calc and try the "send OS" command to see if that will reset your calc to a working state. Sorry to hear about the damage though.
I KNOW exactly what is wrong i had the same problem. you put a program like mirage or another application o your program on your calculator. no kids don't want teachers to deleter their games so mirage has a memory blocker. go into mirage then hit alpha then go to like protection options and stuff and turn off memory block. GOOD LUCK