Mac Mini USB Webcam Audio Input

I purchased a Mac Mini a couple of months ago and set it up with HDMI to HDMI connection to my Samsung TV. I then purchased a Logitech webcam V-UBU48 and connected that to the USB on the Mac Mini. All was fine and I used Skype on this combination with no problems for a couple of weeks, using the webcam as both Audio and Video input device. Sound output was via the TV.
I then went on leave for a couple of weeks and on return set everything up again as it had been before. This time there is no audio input from the webcam and changing settings in Skype preferences or Midi utility does not seem to have any effect, The webcam is recognised as "Unknown USB Audio Device", but doesnt seem to work. So far as the Mac is concerned the video side recognises it as a Logitech Webcam and still works perfectly. Sound output via the TV is also still fine.
Since my return the only change that I can identify is the latest Snow Leopard upgrade to 10.6.4
The other issue is the volume control on the bar at the top of the screen is grayed out and does not function any longer.
Can anyone help identify the issue here. Thanks in advance

Thanks for the suggestions. A few hours after posting my issue I switched everything on and all was as before. I could control the audio input level in system preferences and use the webcam for skype calls as before, using it as the audio and video input device.
Now I have swithched the machine on again and it seems to have reverted back to the same problem as described in my original posting......very frustrating. Nothing registering on the sound input levels in system preferences. Tried restarting several times without success.
The Midi settings for the "Unknown USB Audio Device" i.e. Webcam are as follows:
Source Default (Grayed out)
Format 48000 Hz 1 ch 16 bit
M Channel volume slider is at the mid point, Value 0.49, dB 18.28, Mute and Thru both unchecked
I Channel slider grayed out and all else blank.
Since everything started working again I haven't touched these settings so I assume that they are the same with or without the issue.
I know issues that occur randomly such as this are least likely to find a solution but further suggestions welcome.

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Source Default (Grayed out)
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Source Default (Grayed out)
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M Channel volume slider is at the mid point, Value 0.49, dB 18.28, Mute and Thru both unchecked
I Channel slider grayed out and all else blank.
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