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"Failed to Play Test Tone" aka Poisoned USB Ports
Here's one for you. Running Win7Pro x64. I have a cheap USB sound card (7.1 channel sound), which works fine using Windows sound drivers.
It works with any other computer too, and works with my laptop *UNLESS* it's plugged into particular USB ports on my hub. These two particular USB ports once upon a time fed a different audio device (a Numark C3USB mixer with two integrated sound playback devices). These integrated devices appeared as stereo only sound devices (and they were). They (the audio devices within the mixer) worked fine, and happily used Windows sound drivers.
Now, if you plug the cheap USB sound card into any other port, Windows can play its test tone in stereo fine, or in 7.1 fine.
If you plug the cheap USB sound card into one of these "poisoned" ports, Windows can STILL play its test tone in stereo fine, but trying to play the 7.1 test tone results in the Windows popup "Failed to Play Test Tone".
I've tried uninstalling the driver repeatedly, but somehow Windows just won't accept the 7.1 device on those two ports. It identifies the 7.1 device, it just fails when trying to use it as such (and only on those particular USB ports).
Help???
Last edited by justthisguy; 24 Oct 2015 at 16:03.