voila, après ca quitte tout. merci de ton aide. je vois le log que tu parlais mais avec la nouvelle version je ne le trouve pas.
[21:10:38] [Client thread/INFO]: Setting user: ........
[21:10:42] [Client thread/INFO]: LWJGL Version: 2.9.4
[21:10:52] [Client thread/INFO]: Reloading ResourceManager: Default
[21:10:56] [Sound Library Loader/INFO]: Starting up SoundSystem...
[21:10:56] [Thread-5/INFO]: Initializing LWJGL OpenAL
[21:10:56] [Thread-5/INFO]: (The LWJGL binding of OpenAL. For more information, see
http://www.lwjgl.org)
[21:10:56] [Thread-5/ERROR]: Error in class 'LibraryLWJGLOpenAL'
[21:10:56] [Thread-5/ERROR]: Unable to initialize OpenAL. Probable cause: OpenAL not supported.
[21:10:56] [Thread-5/WARN]: ERROR MESSAGE:
[21:10:56] [Thread-5/INFO]: Could not locate OpenAL library.
[21:10:56] [Thread-5/WARN]: STACK TRACE:
[21:10:56] [Thread-5/INFO]: org.lwjgl.openal.AL.create(AL.java:156)
[21:10:56] [Thread-5/INFO]: org.lwjgl.openal.AL.create(AL.java:102)
[21:10:56] [Thread-5/INFO]: org.lwjgl.openal.AL.create(AL.java:206)
[21:10:56] [Thread-5/INFO]: paulscode.sound.libraries.LibraryLWJGLOpenAL.init(LibraryLWJGLOpenAL.java:164)
[21:10:56] [Thread-5/INFO]: paulscode.sound.SoundSystem.CommandNewLibrary(SoundSystem.java:1576)
[21:10:56] [Thread-5/INFO]: paulscode.sound.SoundSystem.CommandQueue(SoundSystem.java:2572)
[21:10:56] [Thread-5/INFO]: paulscode.sound.CommandThread.run(CommandThread.java:121)
[21:10:57] [Sound Library Loader/WARN]: ERROR MESSAGE:
[21:10:57] [Sound Library Loader/INFO]: Could not locate OpenAL library.
[21:10:57] [Sound Library Loader/INFO]: Starting up SoundSystem...
[21:10:57] [Thread-7/INFO]: Switching to No Sound
[21:10:57] [Thread-7/INFO]: (Silent Mode)
[21:10:57] [Sound Library Loader/INFO]: Sound engine started
[21:11:01] [Client thread/INFO]: Created: 1024x512 textures-atlas
[21:11:05] [Client thread/INFO]: Stopping!
[21:11:05] [Client thread/INFO]: SoundSystem shutting down...
[21:11:06] [Client thread/WARN]: Author: Paul Lamb,
www.paulscode.com