Windows 10: Unable to setup 3rd monitor on Windows 10 - using AMD Radeon HD7700 graphics card with 4 ports

Unable to setup 3rd monitor on Windows 10. Have an AMD Radeon HD7700 graphics card with 4 ports: DVI, HDMI and 2 minidisplay ports. Bought a Mini displayport to HDMI converter and connected 3rd monitor which is recognized fine by the system BUT only any two of the three monitors can be active at the same time - NOT the 3rd one. HOW can I activate the 3rd one please ?

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AMD announces new AMD Radeon RX 590 Graphics Cards

Source: New AMD Radeon RX 590 Graphics Cards Deliver Leading-Edge, Smooth HD Gaming Experience for Latest Games | AMD


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unable to install amd radeon 8670 graphics card driver in windows 10 in dell inspiron 15r

I am unable to install driver for AMD radeon 8670 graphics card in my pc (dell inspiron 15R) which recently upgraded to windows 10.

Help and assistance needed.

 

AMD 7800 4 monitor problem since Windows 10 - SOLVED

In my case, I have found a solution to my myriad problems I was having with the AMD 7800 & 4 monitor setup. These have occurred almost continuously since first running 10 preview. It had come down to only being able to display 2 monitors on the 6
DP AMD 7800 card. I had to run the other two from the built in Intel 4600 with one on DP and the other HDMI. Running an Intel i7-4770K on ASUS Sabertooth Z87.



What worked:

• Remove the AMD 7800 card from my system. Running on the built in Intel 4600 with 2 monitors only.
  
• Uninstall ALL AMD/ATI stuff:
  • Using AMD uninstall utility (the normal method would not run)
  • Delete all AMD/ATI folders I could find, under "users" and in programs etc.
    and on the C: drive.
  • Run the REVO uninstallation tool and use advanced tools.
    • Remove all instances of AMD/ATI from the directory.
    • Run PCTools Registry Cleaner
    • Run REVO again and remove more from the directory.
• Called Visiontek the maker of the 7800 card. During 1 hour on the phone the very patient and knowledgeable tech walked me through a long list of troubleshooting steps. Which included:
  • Installing the 7800 card from AMD and booting up in VGA mode
  • Set the bios to use the external (7800) card.
  • Installed the AMD beta drivers
  • Swapping around cables, monitors and ports. Had variously 1 or 2 monitors of the 4 recognized then had 3 working and one recognized as a generic monitor but not active.
  • Shut down power to the system and unplugged the one monitor with was not active.
    
  • Pressed the power button on the inactive monitor 5 times and the start button on the computer 5 times to discharge capacitors that may have been holding up internal memory of invalid configuration.
  • Disabled the internal Intel 4600 GPU.
  • Uninstalled the inactive monitor and cold booted. Now only two monitors of the 4 active.
    
  • All 4 monitors now recognized correctly but 2 still not active.
    
  • Selected the inactive monitors and extended desktop to them one at a time.
    
• ALL four working on the external 7800 card and the built in Intel disabled.

WAS THIS MS, AMD, ASUS, or Visiontek's problem?