Second display causing perpetual restarting

For the last two years I have used my Mac Pro 2.8 Quad with two displays without any problems. A few weeks ago I had two blank screen after a restart which was only resolved after removing the second display. I changed the second display for a different one and the computer was working fine until yesterday. Now after restarting as normal both screens flicker and restart continuously. It is only when I remove the second display that my Mac Pro works normally. I really need two displays for my work. Any suggestions as to the problem please ?

What card are you running?
Many of the flashed 4870/90 cards now have issues like this.

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