I was playing a game and paused to eat supper, when I came back I had no sound so I restarted the game but my speakers was working instead of the E7. I went into device manager and removed and when I connected it agin the drivers was reinstalled but still did not work. I checked control panel/sound made sure it was set to default and it is. I then used the reset button on the E7 and still won't work, I tested the amp part of the E7 and that works just can not get the DAC to work again. Besides control panel and device manager is there anywhere in Windows 7 to check.