LG Optimus S won't turn on after making high pitched noise

[bullywully123]

I have an LG Optimus S and yesterday, i was using the phone when out of no where it made a high pitched noise and turned off and now it refuses to turn on. I've had the phone since February and i did at one point drop it in water but since then it has washed off and it worked fine for a little while. Recently i have been having a problem where my camera repeatedly turned on. It was very annoying. Now it will not turn on no matter what i do. I've plugged it into the computer with a USB and I've tried charging it for a long period of time and all that did was make it over heated. I'd appreciate any help