Mac Pro Sound Problems

Hello
I use my Mac Pro for editing and have a microphone connected to the audio input port via a mic amp.
Today it has stopped working, its not the mic or the amp because I've tested it on my Macbook.
I've checked the input settings in prefs and restarted and reset prams.
Any other ideas would be welcome
Thanks

Yes, double checked all the settings are correct, disk repair, reset prams, reset SMC, run the hardware test and nothing.
The Mic definately works on my Macbook Pro but nothing in the Mac Pro.
I get now levels in system audio prefs at all.
I use this feature on a regular basis and its just dead now.
Any other ideas appreciated

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