I've been working on a project with a pretty high tech camera. I probably shouldn't be because I'm not that great with electronics. While probing the leads of the switch, something in the circuit made a high pitch noise and froze the system. I removed the batteries, reinserted them, and nothing happens; just a quick flash on the LCD screen and thats it, whether the switch is on or off. Is it possible that I blew a fuse in the switch or something when I was looking for voltages? If I did, would replacing the switch be enough to fix the circuit?

 

You wil probably have to take it in to a shop. The switch is not likely to be the source of the problem. That high pitched noise may have been the flash charging circuit trying to charge some part of the camera processor.