My mac mini says "no display connected".  I disconnected it earlier today, but it's connected now.

About this mac / more info / graphics and didplays says "no display connected"

Actually, I tried a numbner of things:
disconnected and re-connected cables
restarted and reset PRAM
put to sleep and re-awakened
fixed permissions, dumped cache's
complete shutdown, wait ten seconds
the last one seemed to do the trick.

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