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I realise there are a number of similar questions already posted but I haven't seen any where the DVI input involved has been DVI-D. I hastily bought a VGA to DVI converter, then realised the cable I'd bought was DVI-I, which wouldn't fit in my DVI-D port. From searching, I couldn't find any VGA to DVI-D cables. Is there any reason why I wouldn't or shouldn't be able to run dual monitors, with one monitor in a VGA port, the other in a DVI-D port? Thanks in advance for any help and apologies if this is very basic stuff!

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You should be able to run dual monitors on different ports, I've seen it work before. If it doesn't work, you might have to check the documentation for your motherboard to see if there's anything you need to do in the BIOS. –  BryceAtNetwork23 Dec 15 '11 at 13:17

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The problem is that normal DVI has both analog and digital signal and the cheap "converters" only do mechanical conversion.

DVI-D is completely digital and you'll need a converter that will do analog to digital conversion and turn the VGA signal into DVI signal. They seem to be much more expensive but they do exist. It may be cheaper to just change video card or monitor from what I see. This was my first search result for keywords VGA TO DVI-D converter. You might be able to find something cheaper.

EDIT: Actually, I'm not sure I got your question right....

You should be able to normally run two monitors with a video card that has DVI-D and VGA output (if the card supports that and from what I've seen, most do).

The next part of the problem are the monitors. I'm not 100% clear on what type of input they have.

If it's VGA, just connect it to the VGA port on the card.

If it's DVI, just connect it to the DVI port on the card using a DVI-D cable.

If the monitor has DVI-A, then you you'll need to get a VGA to DVI-A converter such as this one for example and connect monitor to VGA port.

If the VGA port is already populated, you'll need a DVI-D to VGA converter such as this one. Same solution needs to be used if you have two VGA monitors. Again it may be cheaper to get a suitable monitor or video card.

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Thanks Andreja. Actually, looking at the monitor, it's got DVI-D as well as VGA. I should really have checked the monitor. So, I should just be able to use a DVI-D cable such as [link]google.co.uk/products/… one to run the second monitor I think? –  harryx Dec 15 '11 at 11:36
    
@harryx I think so. The cable is actually dual link DVI-D, so check the monitor and video card to be sure it fits (it definitely should fit, but let's be safe). –  AndrejaKo Dec 15 '11 at 11:59

DVI-D Is a digital output, while VGA is just analog video. DVI-I <-> VGA is a DVI connector which just maps the subset of pins carrying the analog signal to an VGA connector. The best you can do is to get a new monitor whith a true digital DVI input.

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