My gopro hero is not working

I have had the camera for for a couple years but after i went to the beach in florida it stopped working, I think it might have gotten water inside it. how do i find out whats wrong with it? Thanks, AdamR

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 1
crwdns2934285:0crwdne2934285:0