Oh, so you can't even switch between other consoles? Or is the debug console not working for you for some reason? I. e. when you press Alt+F2, F3, etc., do you see any change at all?
Does SysRq still work, e. g. SysRQ+s (sync), then SysRQ+u (unmount), then SysRQ+b (reboot). If not even that works, then the kernel itself crashed. Did you ever encounter this without "quiet" and "splash"? With more debug information I'm afraid I have nothing in my hands to see where the problem is. My system also boots rather fast (quad-core i5, very fast (500 MB/s) SSD), but I've never seen such a hard lock-up.
Oh, so you can't even switch between other consoles? Or is the debug console not working for you for some reason? I. e. when you press Alt+F2, F3, etc., do you see any change at all?
Does SysRq still work, e. g. SysRQ+s (sync), then SysRQ+u (unmount), then SysRQ+b (reboot). If not even that works, then the kernel itself crashed. Did you ever encounter this without "quiet" and "splash"? With more debug information I'm afraid I have nothing in my hands to see where the problem is. My system also boots rather fast (quad-core i5, very fast (500 MB/s) SSD), but I've never seen such a hard lock-up.