There is no sound from internal speakers and no start up gong.. Can these be muted, if so how do you unmute.. computer works fine with external speakers or headset.. Speakers are oK tried mother board in two other computers and same thing.. no garage band and can't install/download it..
The first thing you should try is to hold down the keys command-option-P-R as you power up the system. That should reset the PRAM in case there is any funny muting information stuck in there. If you hear your optical drive reset more than twice and there is still no chime sounding, let go of the keys because that's not the problem.
Go to System Preferences / Sound. Choose the Output tab. It should say something like "Internal speakers, built-in." When you plug in headphones, it should switch to saying something like "Headphones, Headphone port." If (as I suspect) the output is stuck on "Headphones, Headphone port" whether the headphones are in or out, the problem is most probably a very simple mechanical problem. There is a "shorting strip" in the output jack that makes an electrical connection back to the speakers when a plug is removed, and it may be dirty, bent, or broken off. If it's not broken, it's possible to clean it and/or move it back into position with really fine gauge tools and a steady hand. If it's broken off, you're out of luck unless you want to solder a new jack onto the motherboard (I wouldn't recommend it).
SOURCE: I have an iMac G5
Sir,
The iMac G5 and iMac G5 (Ambient Light Sensor) computers have a video out port located on the back of the computer, which will mirror video. Video mirroring means you can see the same image that is on the iMac G5's flat-panel display on an external monitor, television, or projector.
Using the video out port, you can mirror video with a compatible VGA display using the Apple VGA Display Adapter.
You can also use the video mirroring feature with a television or projector that has S-video or composite video connectors when you use the Apple Video Adapter.
Both the Apple VGA Display Adapter (M8639G/A) and the Apple Video Adapter (M9109G/A) are available separately, and are needed if you want to use your iMac with a VGA monitor cable, S-video cable, or composite video cable.
The video mirroring feature is "plug and play". Simply connect a VGA display, television, or projector to the appropriate adapter (see above), then connect the adapter to the video out port located on the back of the computer.
When you connect the adapter to the computer, the screen may refresh momentarily as the computer prepares itself for the new video output. The computer tries to match the resolution of the built-in and external display. If there is no match, the computer changes both screen resolutions and may black out areas on the built-in display in order to match the capabilities of the external display.
Important: To ensure that your iMac G5 automatically detects the external display or projector, be sure you plug the adapter into the external display or projector before you plug it into the iMac G5.
You can switch resolutions and frequencies for both the iMac G5 flat-panel display and the external display, television, or projector using Displays preferences.
Want to watch a DVD movie disc on a television that's connected to your iMac G5? Select a 720 x 480 NTSC (in the United States) or 720 x 576 PAL (in Europe and other regions) resolution in Displays preferences.
Tip: Because of the display limitations of most televisions, the images displayed on a television screen are usually not as high quality as those on the built-in display or an external monitor.
Thanks
Good Luck
SOURCE: connecting external microphone to imac g5
Get yourself a great little gadget called iMic. It's a usb connector that adapts to let you used your headset mic and the mac system os will recognize it very well. Works good .
Costs about 24 bucks or so..
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