I have a Gigabyte GV-N640OC-2GI graphics card with 2 monitors:
An older Asus LCD with VGA port only. This works fine, plugged into the graphics card VGA slot.
A Dell 1801FP monitor with a DVI-D port. (Got VGA too, but I have to use the DVI-D.)
I have a VGA to VGA cable with DVI-D adapters, so I tried to use them to turn my VGA to VGA cable to a DVI-D to DVI-D cable.
I attached one adapter to the monitor, and the other one to the card's DVI-D port, but it doesn't work. My Windows 7 doesn't recognise it. The NVIDIA Control panel neither. The screen stays blank too.
When I unplug the older Asus, and simply use the VGA cables and ports, it works, but I need both monitors.
I tried to unplug the Asus monitor and just use the DVI-D ports, but that doesn't work either.
Is the problem with the cable? Which cable do I need to make this monitor work on the DVI-D port?
I think that you used "I attached one adapter to the monitor, and the other one to the card's DVI-D port, but it doesn't work. My Windows 7 doesn't recognise it. The NVIDIA Control panel neither. The screen stays blank too." this on the second monitor i.e. Dell 1801FP monitor. and "When I unplug the older Asus, and simply use the VGA cables and ports, it works, but I need both monitors." then this means that your VGA cable is working properly. Then if your VGA cable is working properly then try to first use that cable on the VGA port of second screen. If it's working then maybe your DVI-D adapters are faulty (I assume that Dell monitor is a new one so the DVI ports should not be the fault). And also "My Windows 7 doesn't recognise it. The NVIDIA Control panel neither" I think that you also got an IGD (nowadays mostly all of the computers have an integrated graphics card built-in) so also check whether to change the input when you plug-in the DVI-ports and select your default graphics card in the BIOS to be another one(external one) and then try to see if it works. Also if this doesn't work then first check if your DVI-ports from the graphics card are alright and you are plugging in correctly.
Also if you windows cannot recognise it maybe because you haven't installed the graphics driver of the Card
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