hdmi input to 2nd monitor, boots up (see gigabyte motherboard logo) in colour, then windows kicks in and sends that monitor to greyscale. tried uninstalling, reinstalling updated drivers... to be honest, getting confused, and frustrated etc.
card worked fine with windows 7 for 8 months, so I expect its a windows 10 issue. Any thoughts?
Check the Display Color (Digital Flat Panel) option under the My Digital Flat Panels section in Catalyst Control Center or Radeon Additional Settings. Select your secondary monitor and see if the Color Correction sliders for Hue and Saturation are in the middle.