Camera mmersed in fresh water

Completely dead? Have you checked the batteries? Did you try some fresh batteries? Did you check the contacts from the batteries and in the camera. They should be clean and shiny. eventually clean with a dry cloth, not with a sharp tool.
Were you making lots of pictures in a short time? It could be the camera was over heating and (temporary) shut down. Leave it for a little while and try to use it again.
I hope by the time you read this,the problem was solved.

I'm guessing you tried to turn it on way too soon and fried the circuits. A camera with fresh water damage should be buried in a bowl of dry rice for a week before even attempting to turn it on. Salt water damage?....chances of a complete recovery are slim to none.

Saltwater? I don't think you're going to revive this camera. If it were fresh water - you'd have a fighting chance - but salt water is highly corrosive and is a much better electrical conductor than fresh water. Even if you managed to get the camera work right after it got wet - chances are the salt would eventually "work its magic" and corrode metal circuits inside the camera and cause it to fail - much the way salt "eats cars" in areas that roads are treated with salt in winter to control ice.

If you ever have a water problem with something not designed to get wet, place the item in a bowl of uncooked rice. Cover completely and let it sit a day or two. The dry rice will wick away water and moisture on and inside the device. If doused in salt water, the water will be absorbed - but salt deposits are left behind, as salt can not be evaporated.

I know it wasn't what you wanted to hear... good luck.

If it was salt water, then the camera is irreparable. Fresh water - let it completely dry for a few days before turning it on. Open all compartments to allow the inside to dry. Use desiccant pouches - like the ones they put in beef jerky packages, to sit in the camera.

Probably a total loss. Try a fresh battery and flash card, maybe you'll be lucky.

Let it dry completely.. Take out battery, do not turn on until dry. If wet with fresh water, should still work if not shorted out already. Salt water is much worse. Put it somewhere dry for about a week before trying again.

silly question, but have you tried different fresh batteries? sometimes batteries go dead in the store, especially if they are cheap batteries. try another fresh set.

When you disconnected the camera, did you use the "safely remove hardware" icon at the bottom right of your computer screen or did you just yank out the cord?

This may sound odd, but I read this somewhere. Put the camera in a bag of rice overnight. Rice is a good dehumidifier. Take it out the next day and turn it on.

The unusual beeps usually occur when the lens cannot be extended or retracted, often due to dirt in the gearing or the lens cap being left on.
Try using canned air to blow around the outside of the extension cylinder, and, putting a fresh set of batteries in the camera (it probably got stuck on since it couldn't fully retract the lens and didn't complete the shutdown).
If that doesn't work, try taking it to a camera store with repair technicians and having them take apart and clean the lens extension/retraction mechanism.