I've a four-monitor display that was all working fine for Windows 7.
I upgraded to Windows 8 and immediately after Windows 8.1 After the Windows 8 upgrade two of the monitors were working fine but the other two just displayed the same screen - so in effect I have three screens, with two of the monitors showing the same screen.
After upgrading to Windows 8.1 the problem remains.
When looking at my display drivers it shows
NVIDIA GeForce 6200 (disabled)
NVIDIA GeForce 6200 LE
I've tried installing the latest NVIDIA drivers for Windows 8 but it doesn't seem to have made any difference.
When I look at the personalise screen settings and click "detect" a little grey monitor appears with "Another display not detected" on it (see attached picture).
Any suggestions on what to do next?