Why does my Apple monitor blink off and on?

Laptop and additional monitor:
MacBook Pro late 2009 running Lion 10.7.5, updated
LED Cinema display, 24 inches, Late 2008 NVIDIA GeForce 9400M 256 graphics
The LED display started flashing off & on (to black -- it's not the alert flash, which is turned off in sys prefs). Changing monitor resolution did not fix it. Shutting down and re-seting the video cable plug did not fix it. The laptop display is not affected.
I restarted and reset PRAM multiple times. The on-off blinking continued for several minutes while I started to research the issue. Now, as I am writing this, I realize the blinking stopped after about five minutes or so.
What might be going bad?
Posting this under hardware, too.

My 30" monitor does the same thing with my Mac Pro.  Did the same thing about a year ago and then stopped doing it.  Now, it's starting to flash on and off again.  Connections are all tight.  I think it's a "warm-up" thing?  But, why did it stop doing it for so long and now just started doing it again?  Stops flashing on and off after about a 10-minute warm up period.  

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