You may have to go to Safe Mode to re-enable and still you may find its not working.
One of thebest solutions for this kind of problemis to unplug your monitor and re-plug it.
Some of the monitors facing this issue are
Sometimes, the above solution will also not work.
The culprit can be found in the equipment Manager.
One of the users on TenForums found the solution.
This controller can be in various forums.
One of the devices causing the problem was Razor DeathStalker Ultimate keyboard.
Some other user disconnected his Wingman Joystick and his monitor was going to Sleep mode after the required time.
It was a USB game controller gadget in another case.
So my advice is that, to look at the properties of each equipment for a Power Management tab.
If it is enabled, just uncheck the option.
Also sometimes, you are worried that 2 or 3 monitors also could cause the problem.
But the problem causing equipment is the above controller.
You just have to disable it, finding the right machine.
You may get warnings signs in your gear Manager, which is best to disable them.
There can be a different kind of problem on the X99 Chipset and Asus Rampage V Extreme board.
But the opposite may occur, even if you do the driver update.
Even if you unplug the equipment Saitek X52 this problem may go off.
For another one, its the Razer Onza (Xbox 360 controller).
Unplugging the Logitech Extreme 3D Pro could also fix this issue.
This was observed in the 10074 build.
Im not sure whether this problem still exists in the released version.
The fix for this is to rollback the driver.
This will install a plain-vanilla driver and then you’re able to update that driver.
Source:http://www.neowin.net/forum/topic/1255544-windows-10-10074-not-detecting-dual-monitor-setup-nvidia/
you might also rectify this multi-monitor issue in the following way.
Uninstall AMD drivers inside of apps and features.
Run CCleaner for browsers and registry.
Save backup changes to registry when asked.
Install latest Win 10 Driver for R9 200 (in my case).
Go to CCC, Common Display Tasks.
double-check Extend Desktop is active in Win 10 Display parameters also.
Unplug HDMI monitor cable to PC and wait 10 seconds.
Plug back in to reconnect the monitor.
Push the source button on the monitor.
Source:https://community.amd.com/thread/186003
Sometimes, the resolution can get into problems if you have dual-monitor set-up.
In that case, download the *.inf drivers that come from the computer maker or company.
Normally, monitor do not have drivers, but these come from the motherboard or chipset driver configuration.
This can be resolved but updating to the latest drivers.
But you may have problem if you unlock the 10-bit pixel format support in the Catalyst Control Center.
So better not enable it if you want your HDMI TV to be working.
Source:http://h30434.www3.hp.com/t5/Notebook-Display-and-Video/hdmi-not-working-after-upgrade-to-windows-10/td-p/5173786/page/8
