Please help with 2x5970 crossfire

I recently installed the 2nd ati 5970 video card into my desktop with crossfire bridge. However, when I connect the apple cinema 30 (screen #2) into the 2nd card and restart the computer, only the screen #1 which connected to 1st card is showing up, the screen #2 is all black. I dont know what did I do wrong, please help !
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More about please 2x5970 crossfire
  1. So try to connect your 2nd monitor to the 1st card...
    Surely the 1st HD5970 has more than 1 output, right...
  2. Yea. But what im wondering is why it doesnt work when i connect screen #2 to 2nd card?
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