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Make sure the power supply is working. Quite often you get a pretty crappy power supply with USB devices, so that is what I would suspect. Its a 5 Volt supply, and should get a little warm if its working. I don\'t think this device will work without a power supply.
Those supplies are quite standard, so bring your old one to Fry\'s, MicroCenter, Radio Shack, Best Buy, or even Walmart or the other stores to compare Volts, Amps, and polarity/size of the plug to make sure you get one that will work.
http://drivers.softpedia.com/get/SOUND-CARD/OTHER-SOUNDCARDS/Microsoft-UAA-Bus-Driver-for-High-Definition-Audio.shtml Go to the above site and download the UAA drivers and install them then go to device drivers and Upgrade sound driver it will go on net to find and install them Without the UAA drivers your sound driver will not be recognised
I had to do this to my compaq and it found the drivers through upgrade Please post fixya for me