No sound after starting the game

Please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report here.
Please attach .minecraft\output-client.log

This is because sounds are loaded asynchronously in the background. We may change this in the future, but it will require a new launcher.

Oh ok ;D

I have the same issue and the same configuration. Macbook Pro, BootCamp, Windows 8.

Please read two comments above yours:

[Mojang] Jeb (Jens Bergensten) added a comment - 05/Mar/13 11:19 AM

This is because sounds are loaded asynchronously in the background. We may change this in the future, but it will require a new launcher.

@Jeb: Now that there's a new launcher...

BTW, is this really "intended," or is it just a won't-fix?

This was some stacktrace leading up to me not being able to have sound.
Still happens, and this was 1.9.1 pre 3

[12:50:33] [Sound Library Loader/INFO]: Starting up SoundSystem...
[12:50:33] [Thread-5/INFO]: Initializing LWJGL OpenAL
[12:50:33] [Thread-5/INFO]: (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
AL lib: (EE) MMDevApiOpenPlayback: Device init failed: 0x80004005
AL lib: (EE) MMDevApiOpenPlayback: Device init failed: 0x80004005
[12:50:33] [Thread-5/ERROR]: Error in class 'LibraryLWJGLOpenAL'
[12:50:33] [Thread-5/ERROR]: Unable to initialize OpenAL.  Probable cause: OpenAL not supported.
[12:50:33] [Thread-5/WARN]: ERROR MESSAGE:
[12:50:33] [Thread-5/INFO]: Could not locate OpenAL library.
[12:50:33] [Thread-5/WARN]: STACK TRACE:
[12:50:33] [Thread-5/INFO]: org.lwjgl.openal.AL.create(AL.java:156)
[12:50:33] [Thread-5/INFO]: org.lwjgl.openal.AL.create(AL.java:102)
[12:50:33] [Thread-5/INFO]: org.lwjgl.openal.AL.create(AL.java:206)
[12:50:33] [Thread-5/INFO]: paulscode.sound.libraries.LibraryLWJGLOpenAL.init(LibraryLWJGLOpenAL.java:164)
[12:50:33] [Thread-5/INFO]: paulscode.sound.SoundSystem.CommandNewLibrary(SoundSystem.java:1576)
[12:50:33] [Thread-5/INFO]: paulscode.sound.SoundSystem.CommandQueue(SoundSystem.java:2572)
[12:50:33] [Thread-5/INFO]: paulscode.sound.CommandThread.run(CommandThread.java:121)
[12:50:33] [Sound Library Loader/WARN]: ERROR MESSAGE:
[12:50:33] [Sound Library Loader/INFO]: Could not locate OpenAL library.
[12:50:33] [Sound Library Loader/INFO]: Starting up SoundSystem...
[12:50:34] [Thread-7/INFO]: Switching to No Sound
[12:50:34] [Thread-7/INFO]: (Silent Mode)
[12:50:34] [Sound Library Loader/INFO]: Sound engine started
[12:50:35] [Client thread/INFO]: Created: 1024x512 textures-atlas
[12:50:48] [Server thread/INFO]: Starting integrated minecraft server version 1.9.1-pre3
[12:50:48] [Server thread/INFO]: Generating keypair
java.lang.NullPointerException
	at vp.a(SourceFile:412)
	at vr.a(SourceFile:215)
	at azp.a(SourceFile:52)
	at lp.b(SourceFile:142)
	at byl.a(SourceFile:98)
	at byl.j(SourceFile:130)
	at net.minecraft.server.MinecraftServer.run(SourceFile:427)
	at java.lang.Thread.run(Unknown Source)

See MC-9974.