I have a computer with 3 monitors connected to my nVidia Geforce 660 Ti graphics card. I had to move the computer across the room the other day, and after the move the one monitor connected using DisplayPort refuses to show anything.
GigaByte motherboard (Intel Core i5 & 8 GB memory) , nVidia GeForce 660 Ti with 2 GB memory.
Monitor #1: 27" connected to the graphics card using DVI-D.
Monitor #2: 19" (VGA output only) connected to the DVI-I port on the graphics card using a VGA-to-DVI adapter.
Monitor #3: 19" (same model as monitor 2) connected to DisplayPort on the graphics card suing a VGA cable and a DisplayPort adapter.
The setup did work before the move.
Here is what I tried:
- Switched the two 19" monitors, that proved that the monitors are both good. The one connected using DisplayPort is always the one not showing anything.
- Replaced the VGA cable between the graphics card and the DisplayPort adapter.
If I power-cycle the monitor, the Acer logo (it's an Acer monitor) comes up, the power light is green, but after a few seconds the power light goes yellow and the message "no signal" shows up on the monitor. If I unplug the DisplayPort adapter when the computer is running, and then plug it in again, the monitor flickers a bit (no real picture, though, just a different shade of black) and the light goes green for a little bit. Then it goes yellow and the "no signal" message shows up.
When I look in Windows display properties or nVidia Control Panel, only the two first monitors show up. Windows simply refuses to see the last monitor.