Open Question: My Cell Phone Problem?

okay so today i was out in the snow with my friends and my phone fell and got snow on it, (its happened before and been totally fine) and a few hours later i find my phone off and when i turn it on my mp3 player screen and normal screen start switching rapidly and all the buttons are messed up and random buttons open up random screens but my white indicator thing is totally fine. I have a sony ericsson w580i walkman, any suggestions on what happened?