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Why isn't my dual display working?

Tags:
  • Dual
  • Graphics
  • Displays
Last response: in Graphics & Displays
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September 9, 2013 8:33:22 AM

Okay so here's my problem, I have just got a Sapphire 7750 card for my PC (working very well), however I was previously running a dual monitor setup on my old card and the splitter I had didn't fit the 7750, so I bought a new splitter which fits it. However now when I plug in both monitors to my card none turn on, everything fits and I'm not sure why it isn't working, here's some information you may need to know and some troubleshooting I did which you may find useful:

-One monitor has a VGA output and I have an adapter for that.
-The splitter is called DVI-D Male to Dual 2 DVI-I Female Video Y Splitter Cable Adapter
- To test if it was the splitter I ran one monitor (the non-VGA one) on it's own through the splitter and it worked fine, as if it was connected directly to the 7750
-I have not tried just the VGA monitor through the splitter
-I have used multiple adapters for the VGA monitor and there was no change

Any help would be appreciated

More about : dual display working

September 9, 2013 8:37:03 AM

DVI splitters need a card that supports that feature. DVI-D does NOT have the analog needed for the VGA adapter. the DVI-I port it self should however.

If your DVI screen is 1920 x 1200 or lower in resolution. It is best(only because it frees up the DVI-I port for your VGA screen) to use a HDMI -> DVI cable.
For the VGA screen just use a DVI-I -> VGA adapter.
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September 9, 2013 8:40:11 AM

nukemaster said:
DVI splitters need a card that supports that feature. DVI-D does NOT have the analog needed for the VGA adapter. the DVI-I port it self should however.

If your DVI screen is 1920 x 1200 or lower in resolution. It is best to use a HDMI -> DVI cable.
For the VGA screen just use a DVI-I -> VGA adapter.


Are you saying the Sapphire 7750 doesn't support dual monitors, as I've read lots of places it does? And I'm unclear as to what else I need to make this setup work then, linked products would be useful.
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September 9, 2013 8:42:02 AM

No i am saving that splitting DVI does not work on all cards.

It supports one DVI/VGA screen 1 HDMI and 1 display port screen like almost all amd cards.

getting product link please stand by. better yet, please link to a store you shop at as well as the exact card.
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September 9, 2013 8:44:38 AM

Oh okay, so I need an HDMI cable for my main monitor, and I can then just use the DVI cable that is then free'd up and put it on my monitor which was previously VGA ( It has space for a DVI cable I just never had a spare one).
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September 9, 2013 8:50:40 AM

Yeah, do that.

The HDMI port is nothing more than a single link(hdmi can use faster clocks to compensate to only having a single link, but will drop down to match dvi speed) DVI + audio anyway so as long as the screen is under 1920 x 1200, it should work fine.

You can use a DVI-I to VGA adapter if you wish on the DVI-I port.
like this. chances are you already have one :) 
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September 9, 2013 8:53:33 AM

nukemaster said:
Yeah, do that.

The HDMI port is nothing more than a single link(hdmi can use faster clocks to compensate to only having a single link, but will drop down to match dvi speed) DVI + audio anyway so as long as the screen is under 1920 x 1200, it should work fine.


Yeah my screen is 1680x1050 however having just looked at my main monitor there is no HDMI port, just a DVI and VGA, how do I go from here?
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September 9, 2013 8:59:26 AM

Okay I'll look for something like that in the UK and yeah sound shouldn't be a problem as I run that from separate speakers, thanks for your time.
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September 9, 2013 9:14:00 AM

Any time.

Most electronic stores carry such cables, but tend to over price a bit.
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