Is the phantom power on to the mic?
Is this an interchangeable capsule mic? If so is the capsule correctly mounted?

Phantom On. No its just a normal Behringer C3 Condenser Mic. Nothing special. Just wondering if its got anything to do with the software? I use Audacity.

Josh

Is there a clip meter on the berry board, if so can you raise the gain and get it to clip? No meters, hookup speakers to board . Trying to make sure that the mic, cable and board are working correctly.
Next check the cabling between board and computer, can the computer "see" the board.
Then check input routing and drivers in software.
Start at source work towards end checking each connection/routing.

Make certain pad switch is not engaged on mic.

It sounds to me like you are experiencing an improper cable connection somewhere. If you plug a different source-NOT a microphone- to the mixer do you get signal/sound? Try a keyboard or drum machine, for instance. If that works OK, I'd say that there's an issue with the XLR cable that you just aquired for the mic. Otherwise, I'd look at the connection between the mixer and the PC.
In certain countries (like the UK) XLR connectors are wired differently than ones in the States. I forget the difference (it may just be the +/- polarity), but if it is a ground wire issue, this would give you the buzzing and the non-signal problem you described. BTW, your reference to the "leads" made me think "UK"...no? If so, perhaps Boswell could clarify the XLR wiring protocols in the UK?

I thought the difference was a matter of an old way of working and not a location thing?

I don't know...that may be the case. I just know that all of my US-written tutorials that came with my Japanese-built sound gear (Yamaha) went into a great deal of detail to describe the differences between US, Jap, and UK wiring schemes. Of course, that was back in the days when we hauled gear by oxcart and operated par cans by gas...
But in any case, the problem as the poster described it seems like a cable problem.