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Cannot enable/detect 3rd monitor in Windows 10
I need help from the community. I've got a three monitor setup that is no longer working as expected. Monitor #3 is no longer showing up in "Customize your display"
My setup is as follows
Nvidia GTX 570 : Monitor #1, Monitor #2
Onboard Intel 4600: Monitor #3
OS: Windows 10 build 10532.
I was playing with mame and it wouldn't start on my main display. So I went into Settings->System->Display and disabled monitor #1 & #3. After playing games I went back to this window to re-enable the monitors and only #1 & #2 show up. #3 is not listed. Clicking "Detect" only shows a dialog saying no additional displays could be found. All the hardware is listed in device manager, just not in the settings->system->display section.
What I've tried
I've deleted monitor #3 and the Intel Graphics adapter in Device Manager and re-scanned for hardware changes.
I've pressed Win+P and made sure that the display is set to Extend.
Re-installed the latest Intel & Nvidia drivers.
Jumped up and down like a frog in a sock.
Any ideas would be appreciated.