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ok, i have had to deal with these same issues,in my case and sounds like yours as well, audio chip or motherboard damage. these are not user repairable. so if a desktop add a sound card or laptop get an external sound card (box) this is an easy answer to failed audio chip. i bought a creative labs live external and what a impovement over the onboard sound! if it was just the driver that failed..request the hotfix for the uaa high def.http://support.microsoft.com/ good luck! hope this helps you..
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
The most common solution was this: open device manager click
"system devices" disable "microsoft UAA bus driver for high definition
audio" uninstall "UAA bus driver" make rescan devices (Note: Not all
had this step. You may want to skip it.) D.W. install realtek driver
the realtek driver includes the UAA driver too.Hope this