I am having similar problems.
When I first installed my AMD FirePro W600 a few days ago, I could only get 2 of my 5 monitors to receive signal. After almost throwing my hands up and just before I was about to discount the card as a lemon, I found out that in order to get more than 2 non-native DP monitors to display using W600, the MiniDP to DVI cables must be "active" cables or have an active adapter. Once I installed active MiniDP to DVI adapters on the 3 cables that weren't carrying signal, just like magic, ALL 5 monitors began to receive signal and were displaying. I even got them aligned well enough via my Windows 10 display settings to effectively extend my desktop across all 5 monitors. I thought my monitor troubles were over, so I decided to change tasks and was trying to repair whatever had happened to my PC's sound, as it had stopped working altogether immediately upon installing the W600 software and drivers.
While trying to get the sound to work, I had both the AMD FirePro software open along with Windows Device Manager. All I did was disable then re-enable the 5 "sound" devices that were now residing in Device Manager, because it appeared that installing the W600 had created one for each monitor while simultaneously deleting whatever generic 3.5mm motherboard integrated plug-in sound device had existed prior to that. Not sure if it was at that moment, but right around then, 2 of my 5 monitors stopped receiving signal. I rebooted several times to no avail, even unplugging and plugging back in, switching MiniDP ports, and whatever else I could think of. I began to think that maybe 2 of the 3 "active MiniDP to DVI adapters" were defective, but was proven wrong when I started switching the cables at the back of the monitors, during which time I was able to get both of those monitors to receive signal, just not when all 5 monitors were plugged in at the same time. In fact, I was able to get 4 of the 5 monitors to display but only when certain other monitors were plugged in tandem. Plugging in a 5th monitor, regardless of which one, causes those same 2 monitors to go black every time.
When I ask any of my pseudo-techie pals for help, they all tell me to bring the AMD card back and get an NVIDIA because they don't have any of these issues. I'd really hate to believe that's the case and is what must be done, so I'm hoping that someone on here hears my cry for help, knows what has gone haywire here, and how to fix it. I just want all 5 of my monitors to receive signal just like they were before the W600 decided that it only likes 3 or 4 to work simultaneously, but not all 5... and I'd also like my sound back, as well. PLEASE HELP!!!
