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?