Normally Fn+F2 is the hotkey for Wifi cards. The bluetooth card is turned on and off a different way. Actually, a high-pitched noise can sound kind of cool... Because there are no moving parts inside a wireless card, it is hard to locate what the noise actually us. Try just listening to different parts of the computer while the wireless is on to figure out what part of it the sound is coming from.

As for the mouse, go through the normal steps... reinstall the drivers, and see if you can make it work on another person's computer that has bluetooth. It is remotely possible that these two problems are related, because they both involve wireless. If your keyboard is bluetooth also, try turning off your mouse or taking it out of range and then turning on your bluetooth module.