Could you describe the hang in more detail?
Does:
Caps-lock work (eg. change the LED)
Alt-SysRq-s Alt-SysRq-u Alt-SysRq-b reboot the machine?
Pressing Fn-F8 again (once/twice) solve the issue.
Ctrl-Alt-Delete do a controlled reboot (eg. about ~60seconds)
Removing and reinserting the power-cable.
Closing the lid, suspending or hibernating do anything?
Could you describe the hang in more detail?
Does:
Caps-lock work (eg. change the LED)
Alt-SysRq-s Alt-SysRq-u Alt-SysRq-b reboot the machine?
Pressing Fn-F8 again (once/twice) solve the issue.
Ctrl-Alt-Delete do a controlled reboot (eg. about ~60seconds)
Removing and reinserting the power-cable.
Closing the lid, suspending or hibernating do anything?