I just re-install windows 8.1 then I've installed Windows8.1-KB2939087-x64, Windows8.1-KB2975061-x64, Windows8.1-KB2919355-x64, Visual C++ Redistributable for Visual Studio 2015 and Google Chrome. At that point everything worked normally except that the monitor identified as #2 in the picture below displayed the full HD (1920x1080) improperly.

To fix that I downloaded the Graphics driver for my APU processor with graphics (AMD Fusion APU A4-5000 Quad-Core with AMD Radeon HD8330 Graphics). That's when the second display went haywire and displayed everything in grayscale (though now 1920x1080 takes the entire screen unlike before)

Here is what I get: color screen against grayscale screen I had to photoshop it to grayscale to show you what it looks like because when I take a snapshot of the desktop (print screen) the picture is in full color.

I've also tried to reset my monitor; nothing changes. Also when I boot to windows 10 the color is back again which means this comes from windows 8.1 somehow.

  • If the screen shot is in color, then a color image is being sent to the display. Check your cable connections and consider replacing the video cable to the monitor. Mar 24 '18 at 16:20
  • @Twisty Impersonator like I said when I boot to windows 10 both monitors are in color which means it can't be the cable or the monitor.
    – Paiku Han
    Mar 24 '18 at 16:27
  • indeed ... I missed that, however we must still say Windows is sending a color image. What happens if you switch the video cables of your two displays? Mar 24 '18 at 16:28
  • I can't. One is vga the other hdmi
    – Paiku Han
    Mar 24 '18 at 16:37
  • Let me guess, the greyscale monitor is the VGA one? Mar 24 '18 at 16:39

This has happened to me on occasion as well. Check for a grayscale filter being applied.

  1. Right click on desktop and choose Personalize
  2. Click Themes on the left bar and then choose 'High Contrast Settings` on the right side.
  3. There will be a slider called apply color filter. Make sure it is off. Reference image: https://i.imgur.com/v8cauHU.png

The same menu can also be accessed from control pane > ease of access.


Problem solved by uninstalling the latest graphics driver and installing an older driver

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