Hi, have the same problem. I have a AMD R9 270x. I have windows 10 pro, last driver installed, 3 monitors connected by:
1 hdmi monitor to DVI (graphics card)
1 hdmi monitor to HDMI
1 hdmi monitor to card's dvi port with adapter (ACTIVE)
I tried everything i could find in internet and nothing worked. Here are some pictures of the problem:
![Monitor desconectado.jpg Monitor desconectado.jpg](/t5/image/serverpage/image-id/17120i42DCCF863A32B195/image-size/large?v=v2&px=999)
As you can see, third monitor is not active, but connected by HDMI to DVI with an active adapter.
![Monitor imposible de activar.jpg Monitor imposible de activar.jpg](/t5/image/serverpage/image-id/17121i7BF1FE24FD1E4477/image-size/large?v=v2&px=999)
I dont know why i cant activate this monitor. When i disconnect one of the others, this one turns on. The problem is that i cant set 3 monitors at once.![MONITOR AMD NO DETECTADO.jpg MONITOR AMD NO DETECTADO.jpg](/t5/image/serverpage/image-id/17122iCB7942E12D8B1139/image-size/large?v=v2&px=999)
Finally, here is the AMD settings, not detecting the third display.
I really hope you can help me, i think may be is a issue of windows version? i dont know. PLEASE HELP and excuse me for my lack of english.