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I've got a Dell Vostro 470 with an AMD Radion HD 7570 graphics card. On the back of my computer, I see a VDI port (looks like it is added as extra) and a VGA port. The primary monitor that I bought with the desktop pc is attached to the DVI port.

Now I've got another ACER AL1721 monitor that I want to attach as a second monitor, so I plug it in into the VGA PORT but nothing happens ("no signal"). The screen resolution window doesn't show a second monitor nor does the Catalyst Control Center.

How can I make this second monitor work/recognized.

What I have tried

  1. Click 'detect' on the screen resolution window and Catalyst Control Center
  2. Tried the second monitor on a laptop, works
  3. Restarting computer
  4. Updating AMD driver (not sure if I updated correctly, manually searched for an update)
  5. Went into my BIOS & turned on 'Intel Multi-Display'
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1 Answer 1

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This is because you are plugging your second monitor into the onboard graphics and not into your video card.

enter image description here

On the back of your computer where you have your DVI connected is the graphics card (green square). You have your second monitor plugged into the motherboard (red square).

In order to plug in your second monitor as VGA, you will need a second DVI port (most graphics cards have two, it should be next to the DVI you are using) and a VGA to DVI adapter.

A second solution is to get a DVI Y splitter which will take two DVI inputs and turn them into one DMS-59 input which is supported by most modern video cards.

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There's only a HDMI port next to it. Where would you localize the DMS-59 input then ? Can't find anything like that when I google an image of it. –  Serge Morel Jul 27 '13 at 20:52
    
@SergeMorel Then you may need to go with the second option and pick up a DVI Y Splitter. This will let you use one DVI port for two monitors. Of course this also means getting a VGA to DVI adapter for your second monitor. If your second monitor supports DVI though, you could just grab a DVI cable and use that, but either way you'll need a splitter. –  Jason Bristol Jul 27 '13 at 20:55
    
It supports DVI (second monitor), guess I'll have to go buy a DVI Y Splitter. I can still have an extended monitor with this right ? Or will it just be a duplicate ? –  Serge Morel Jul 27 '13 at 21:31
    
It should support both extended and duplicate. If you wanted you could even connect your DVI monitor via HDMI and then use the VGA to DVI adapter for the second. Not sure if that is any cheaper, but it would probably save you the hassle of splitters if you wanted to go that route. –  Jason Bristol Jul 27 '13 at 23:21
    
I just bought myself a HDMI to DVI cable to connect the second monitor to the HDMI port on the computer's back. –  Serge Morel Aug 4 '13 at 13:37

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