catatonic adj.
Describes a condition of suspended animation in which
something is so wedged or hung that it makes no response. If you are
typing on a terminal and suddenly the computer doesn't even echo
the letters back to the screen as you type, let alone do what
you're asking it to do, then the computer is suffering from
catatonia (possibly because it has crashed). "There I was in the
middle of a winning game of nethack
and it went catatonic on me! Aaargh!" Compare buzz.