2nd display turns black  - yet can be prompted on for brief time

This morning the 2nd monitor went black.  Power is fine and cables have been checked. 
When I push power button to the monitor on and off the screen will display for roughly one second.  then black again.  same happens on a restart.
any ideas?
Thanks.....

Does the "second" monitor work at the only monitor?
Can you switch connections with the working monitor?
Does the "second" monitor work with another device?
How are both devices connected?
What graphics card is installed?
Do you really still have 10,.6.6?

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