Primary screen goes dark when external display is added

Hi,
Earlier, when I was on Mac Lion, I always used to face problems whenever an external Monitor was added to the Mac through the firewire to VGA converter port.
Hoping that Mavericks update would give me a respite from the issue, I upgraded my Mac Pro and to my utter shock, the issue has got magnified in mavericks. The primary screen goes completely dark whenever I add the external monitor.
Any idea how to overcome this issue ?
Thanks in advance !

I meant the mini Display Port intead i wrote firewire port.. Hope it doesn't confuse anyone !

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Primary screen goes dark when external display is added

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