I picked up an indigo iMac G3 500MHz about a week ago with a known issue that the built-in speakers aren't working properly. So far I haven't had much luck getting the speakers working again. I can get sound to work through headphones when I plug headphones into either of the 2 headphone ports on the front. No sound when I plug into the audio output port on the side of the iMac. The only thing available under sound output in Sys Prefs is "Headphones Port: Built-in Audio". Audio under System Profiler lists this: Built In Sound Card: CODEC: Apple Screamer Sample Rate: 44.1 KHz Number of Inputs: 2 Number of Outputs: 2 Devices: Input: Type: Internal Microphone Input: Type: External Microphone Output: Type: External Speaker Output: Type: Internal Speaker I guess that looks ok? I've tried a few things I found while googling - new user account, PRAM reset, pushing the PMU reset button on the logic board. The other day I opened the iMac up and tried changing the board with the 2 front headphone ports on it with a different board I received with this iMac. A few sites I read on said that headphone board was the most likely cause of not getting sound to output from the speakers. The front headphone ports don't seem loose or anything. The replacement headphone board didn't help though (assuming that board isn't bad). I still only got sound when plugging headphones into the front ports. I'm wondering what else I can try at this point. Do I need to completely dismantle the iMac and check to see that the cables for the speakers or headphone board haven't somehow come loose from the logic board? Hopefully someone knows an easier fix before I go through all that trouble..!!