Blank screen on second monitor using HD 7950

So after about 6 days of pain and struggle, I finally managed to get my first hack to work. My 7950 Dual-X wasn't working out of the box, so i used the .rom file from the 280 and finally got it to boot.

My problem is now, I cannot get my second monitor to work. I have both of them connected through the DVI ports, while my second monitor (the one which is not working) is connected via VGA to DVI adapter. The monitor is recognized through the Display setting under System Preferences, but I cannot get any output from it.

Any solutions to this problem, or should I just give up on the second monitor? If there's no way for me to connect both of them through the GPU, can I use the second monitor via my integrated GPU?

My specs: Asus P8Z77-M

i5 3570k

HD 7950 Dual-X w/Boost 3GB

8GB RAM

High Sierra 10.13.3

Thank you.

submitted by /u/ivanSW
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