Minecraft crashes on starting (no real bug report)

I just buyed the game and it crashes in a few seconds when I try to start it. Even if I try to change versions, it still crash the same way. No crash report shows up at all! I joined the "game output" screenshot I took just after the crash, and the "lastest" file in the %appdata%/.minecraft/logs shows this:

[22:23:14] [Client thread/INFO]: Setting user: pToni
[22:23:16] [Client thread/INFO]: LWJGL Version: 2.9.4

And then, nothing else. I tryed to restart the PC then to re-download Java. Thanks for any help!