Audio-In Port does not recieve input

I tried to use my headset with the MacPro with no luck. I get sound out but when I talk nothing happens.
I went to System Preferences> Sound> Audio IN selection. Then talked into the mic of the headset, Nothing happens or registers on the input level graph with the volume all the way up,
I'm plugged in the back on the unit in the correct audio-in port adjacent to the fan. Tried two headsets that work okay on my PC. I understand there is no sound card only a chipset on the motherboard.
I called Apple Care and went through steps with the tech rep No solution there. She says I have to bring it in for service.
Just got through driving 30 miles roundtrip to have the CompUSA Apple Tech take a look. No luck there, A tech won't be available till Monday night.
I can get by until then. No biggie just a hassle to get everything running smoothly like on my Sony Vaio PC.
I use my headset plenty for VOIP protocol on Skype. Since I have no landline here at home only a cellphone, I do all my calls at home on Skype. Which by the way is free till the end of the year.
Does anyone have any solutions or similiar problem with their MAC Pro? I was thinking maybe about purchasing a PCI Express sound card and putting it in one of the empty expansion slots instead of lugging the computer back to CompUSA again. Dern the thing weighs as much as a half a bale of hay!
Cheers
Mac Pro 2.66 GHZ, 1 GB RAM, 250 GB HD Mac OS X (10.4.7) Sony Vaio Desktop PC, Toshiba Satellite Pro Notebook

Waymen,
Thanks for taking the time in answering my question and solving my cyber audio problem. I'm new to the MAC world. I figured I could just move my current headset over from my PC to the Mac Pro and plug it in to the audio-in
You are the first to finally give me the answer. All the professionals who sell and service the unit were giving me the wrong scoop.
I Googled the Griffin iMic 2 and thats the solution. Reasonably priced also. Thanks
Cheers
Mac Pro 2.66 GHZ, 1 GB RAM, 250 GB HD Mac OS X (10.4.7) Sony Vaio Desktop PC, Toshiba Satellite Pro Notebook

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