How to setup Bluetooth Antenna?

If the machine had come with the hardware installed, then antenna would have come with the machine and you wouldn't have had to purchase the antenna. In fact, the G5s usually came with the antennas for Bluetooth and AirPort even if the computer didn't have the necessary hardware to support those features.

Are you the original owner or was this a used G5? Where did you buy the antenna - they should be able to supply you with the card as well.

This is what you bought, correct? You still need the module board and the screws.

The photo doesn't change anything - just because the ports are there doesn't mean the module is installed. If you were to open up the machine, you'd likely find wires connected to those ports that either don't go anywhere or go to part of the motherboard where the module would plug in.

My parents' G5 doesn't have AirPort and the plugs on the back are still there.

I don't have a copy of the factory service manual with me to check where the module plugs into the motherboard. The user manual that came with the machine won't tell you, as this isn't considered a user installable part. I can check this evening if I remember. The only way to be absolutely sure is to check inside the machine for the module. The ports on the back don't tell you anything.

The Apple Service Manuals will tell you, but since they're intended for service centers and not the general public, they're not available for download to just anyone. If you look hard enough, you can find them on the internet, though.

Which dual 2.0 do you have? There were four different models with 2.0 GHz CPUs? http://www.everymac.com/systems/apple/powermac_g5/index-powermac-g5.html

I have the service manuals for the original G5 and the Late 2005 model. You definitely don't have the Late 2005 model, but the service manual I have for the original G5 might still show me where the Bluetooth module would go even if you have a later model.

Here are links to images of where the Bluetooth module resides in the original PowerMac G5:

http://img98.imageshack.us/img98/8862/bt2lr9.th.jpg

http://img98.imageshack.us/img98/3386/bt1nr3.th.jpg

You just bought the little cylindrical antenna for the back? Did you purchase the Bluetooth module as well? The antenna won't do anything without it.