This is with a Gigabyte A75-UD4H motherboard. I plug monitor into the 6670 and install windows then i restart and go to bios and set init display to Onboard. Then i save and shut down, plug monitor into integrated gpu port and log into windows and install 6670 driver and all the chip-set drivers. Then my screen gets fuzzy and crossfire still isn't working.
Chances are that the card could be bad but first you need to make sure the onboard is working right which it should then test the card seperatilly in a another rig to rule it out. If both check out then maybe the board but if every thing is ok then you are going have to wait for software issues to be resolved.