Hmm... mine JUST started doing this same thing... only twitches with the on/off switch, no response to the controller. It happened after I slid into my cat's water bowl.

I broke it allll the way down, pulled out the ESC/Reciever board, and cleaned them with anhydrous then an air compressor. While I was at it, I swabbed all the other crap out of the chassis. I run my xmods outdoors a LOT, so there was a bit of sand, dirt, and other debris in there. Cleaned out the heatsink, cleaned all the heatsink grease off the heatsink and thr chips, put 2 little dabs of arctic silver 3 on the chips and put everything back together. She works now.

Might be pure coincidence, but maybe let it sit for a few days and see if it works? Or if you dare, take it apart and clean/dry it out. It could also be something other than water, like just good old fashioned fried circuitry.