Since 1.7.4 (i guess) I have no Sound in Minecraft. I have re-installed it, installed a new Java version and all, but there's no sound. In the Screenshot you can see that MC is running, but not shown in (any Source of) the Soundmixer. I didn't changed any options in Windows or Minecraft, the volume is at 100%.
I mentioned this problem already to the Twitter Account of the Mojang Support, they had no idea and linked me here.
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kumasasa
Please attach the complete output of the "Development console" which can be found on the second tab of the launcher.
If the launcher closes after game start, please edit your profile and select "Launcher visibility" then, "Keep the launcher open".