Ctrl Alt Backspace
Kills X11 and restarts it (not much of a help, but there it is)
Ctrl Alt + (or -)
Cycles through video modes in Linux (maybe one of them will work)
Ctrl Alt F1
Takes you to the console, then either "reboot" or "shutdown" (and use a boot-time command-line switch next time)
or "xf86config" (for manual config of keyboard, mouse, video card, monitor)
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