Dead ipod...HELP.!

Hello,
I RECENTLY DROPPED MY IPOD IN THE SINK WITH A LIL WATER IN THE SINK..AND I HURRIED AND RINSED OFF MY IPOD IT WAS STILL WORKING BUT ALL OF A SUDDEN IT SHUT OFF AND SET BATTERY LOW BUT IT WAS FULLY CHARGED THEN AFTER THAT IT WOULDNT COME BACK ON THE APPLE LOGO DIDNT APPEAR WHEN I RESTARTED EITHER SO I TRIED CHARGING IT WHEN I CHARGED IT THAT THE ONLY TIME IT COMES ON BUT IS STILL BE ON LOCK EVEN WHEN THE OLD BUTTON IS NOT ON..AND WHEN I TKE IT OUT OF THE COMPUTER IT GOES RIGHT BACK OUT PLEASE HELP ME WHAT SHOULD I DO..AND I DONT WANT TO BUY ANOTHER ONE....PLEASE HELP ME.!!!!!!!!!!!