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I have 3 monitors and can only get two to work at any one time. They are 1 VGA, 1 DVI and 1 HDMI. They all work as a set up of two but I cannot get all three to work together.

Does anybody have any ideas ?
Jun 7, 2011  • #1
Keith Lammers (BFS)'s profile on
DisplayFusion will only support as many monitors as your computer can output to, but I'll see if I can provide some advice anyhow. Is your system a laptop or a desktop?

Some laptops can only output to two displays at a time, even if they have more than two outputs.

If it's a desktop, do you have one video card with all of those outputs? Or are you running two video cards?
Jun 7, 2011  • #2
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From what you're saying you can get any combination of two working at the same time, so it definitely looks like the card/motherboard doesn't support all three.

From memory most AMD motherboards don't allow output to both 'digital' outputs at the same time (certainly the case with the last AMD mobo I used). Intel boards for the i3/5 CPUs also have a two output max limitation.

I'd suspect that most non-high-end video cards would also have this limitation.

If it's a desktop a cheap $30 video card will give you a third desktop. Just make sure to buy something that uses the same drivers as your current card to keep things simple.

Windows XP doesn't support multiple video drivers. Windows 7 does and I believe Vista does too.

If you're on a laptop you can get USB-based video cards too.
Jun 7, 2011  • #3
Keith Lammers (BFS)'s profile on
Indeed! I forgot about onboard video on desktops, I always use expansion cards

And yeah, my laptop can only output two displays at once, so I use a USB DisplayLink adapter as well, which you could also use on a desktop PC if you don't want to install an internal card.
Jun 8, 2011  • #4
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