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What type of DVI to VGA Cable should I purchase?

Last Modified: 2013-11-08
HP LaptopI have an HP EliteBook 8560w and an HP 230W Docking Station.

Docking Station Link

I have two Samsung 24" Monitors.

I would like to Dock the Laptop in the Docking Station and benefit from the Dual Monitor Setup.

Here is where things get tricky:

I already have a workstation in place that uses the DVI Inputs on the two Samsung Monitors for its video signal. To make matters worse, the Docking station for the HP Laptop has 1 DVI and 1 VGA output.

So, what I need to accomplish is the following:

Laptop > Docking Station > 1 VGA Out | 1 DVI Out >  Monitor's VGA In | Monitor's VGA In

I ordered a DVI to VGA Cable from Amazon, but it didnt fit in the DVI Port on the back of Docking Station. I did a little more digging and I think it was because the DVI Connection on the Cable was a DVI-A, but the docking station port was a DVI-D [not sure about that].

I am not a hardware person so I need a little assistance identifying and understanding DVI Technology, the hardware on my laptop and how the signal should be properly routed through the docking station to the Samsung monitors.

I think I need to know the following:
1. Does my laptop send an analogue signal through the DVI output, or is it only digital?
2. Is there a cable [compatible with my laptop] that will successfully convert the DVI signal to VGA?
3. Will I lose the maximum supported resolution of the laptop by using the VGA Outputs?

Anyway, hope all this makes sense. Let me know if you have any additional questions.
Note: I am aware that I could just simplu unplug on DVI cable and use that input when I want to use the docked laptop -- I am lazy. I also know that I could invest in a KVM Switch, but some of the ones I priced were around $300 beans which is a little out of my price range.

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