Broken USB Sound

Hi all,
a speaker system with USB sound card worked seemlessly for long time. Suddenly it stopped working. The sound is now blurred (is this the right word).
Is there any way to re-install the original USB sound driver?
Any ideas are appreciated.
Thanks in advance,
Chris
iMac Core Duo   Mac OS X (10.4.8)   1.5 GB RAM - 250 GB HD

If it were me, I'd drop in on a cheap store with easy return policies, like Walmart, and buy a $20 usb microphone/headset. Just about any one should work with the Mini (I use a Logitech model sold for the Playstation on my Mini.)
Then I'd plug it in and see if you get sound. If so, then a more sophisticated usb sound device will likely work fine, such as the iMic:
http://www.griffintechnology.com/products/imic
(And I'd return the cheapo headset to Wally-World.)
Bottom line: I think you'll only be able to answer this question by trying it out yourself.

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