I am a teacher and am in charge of a student Mac lab. All of the computers are g5's, none have built-in cameras, but all should, as far as I understand, have built-in microphones. On some of the computers, the internal microphone works fine. On a few, it doesn't show up in the Sound, Input panel. All that shows up is "Line-In". I'm pretty sure that "Internal Microphone" should be an option. So why isn't it?
So, apparently we have a mix-and-match assortment of G5's, most are original models, and some are the Ambient Light Sensor models (which are the only ones with built-in microphones). Thanks all for your prompt and helpful advice!