I recently installed a GTX 550 TI, and soon after I installed the drivers I lost all sound.
-enabling sound in bios (it was never turned off) -Uninstalled all NVIDIA Drivers including display and sound, and just installed the display without the sound drivers -Installed my LENOVO drivers that came with the pc -Uninstalled the Realtek Audio drivers -I used speakers/multiple headsets
Also, when I try to right click and test the speakers it tells me "Failed to play test tone"
I made a second partition and installed Windows 7 on there and the sound works just fine. If anyone could help that would be great.
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i had that same problem. make sure to go into the control panel to performance and information tools and re-fresh or re-rate your system. seems like it worked after that.