- What is your graphics card?
- What is your OS?
- How do you disable secondary monitor, in Device Manager, in Windows Display Properties or Catalyst Control Center?
- Any adapters used?
- What are the make and model of your monitors used?
1. AMD r290x
2. Windows 7
3. Catalyst Control centre or Display properties
Using HDMI & DVI ports
not sure of screens, a samsung and a cheap knockoff brand
But like I said, it was working fine, and none of these things have changed. Nothing has changed that I know of. Just started happening one day