I hadn't played Minecraft in a few days prior to this, but when I fired it up, I had no sounds whatsoever, either in the menu or the game. First thing I checked was in-game, and all audio settings were set to 100%. I then tried the "Hold-F3-and-push-S" thing, and that had no effect. I then deleted the entire .minecraft folder (after having copied my saves out) and reinstalled, and even deleted my Minecraft.exe and re-downloaded it from minecraft.net. None of those had any effect.
I tried downloading a sounds set, with no effect. I looked in the assets/indexes/1.7.10.json file to see what files were there, and verified that the sounds exist. For example, I checked the walking on grass sound, found the file, made a copy to .ogg and played it in VLC, and it played fine.
I rebooted into Fedora and played the java version (same computer) and it plays the sound just fine, so I'm wondering what the issue is with Windows 7.
Anyone have any suggestions?