Crossfire no signal

when i use one graphic card the system runs in perfect condition, but when i insert second graphic card i dont get any reception to monitor.
i use 970a ds3 motherboard, xfx hd7770 graphic card and coolermaster 600w. i cant even go into bios with two graphic card installed.
7 answers Last reply
More about crossfire signal
  1. Did you install the crossfire bridge?
  2. So you have two 7770s? Did you try the second card in place of the first?
  3. i did works in perfect condition
  4. i bought everything today
  5. If you haven't done so already, update your motherboard to the F4 firmware revision
  6. i tried installing exe version of f4 firmware but no use
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