Dit kwam ik ergens tegen en kan je doen als het scherm niet meer lijkt te reageren:
If the system doesn?t respond to any of these steps, you have to go through the SysRq (System Request)
sequence. The SysRq sequence involves pressing three keys at once: the left Alt key, the SysRq key (labeled Print Screen on older keyboards) and a letter key.
a. Alt-SysRq-R puts the keyboard in "raw" mode. Now try pressing Alt-Ctrl-Backspace again to kill X .
If that doesn?t work, carry on.
b. Alt-SysRq-S attempts to write all unsaved data to disk ("sync" the disk).
c. Alt-SysRq-E sends a termination signal to all processes, except for init.
d. Alt-SysRq-I sends a kill signal to all processes, except for init.
e. Alt-SysRq-U attempts to re-mount all mounted file systems read-only. This removes the "dirty flag"
and will avoid a file system check upon reboot.
f. Alt-SysRq-B reboots the system. You might just as well press the "reset" button on your machine.
Remember that this is a sequence, i.e. you have to press one combination after the other in the right order: Raw, Sync, tErm, kIll, Umount, reboot.