Trouble using 2 VGA Monitors

I purchased a pluggable USB 3.0 docking station. I thought I could use 2 VGA monitors with it, using adapters. I purchased an adapter to connect one of them to the USB port. This doesn’t seem to be working.

Hello Greta,

Thanks for contacting us! We’re sorry that your VGA displays aren’t working with your USB 3.0 Docking Station as expected.

You can connect two VGA displays to our UD-3900 Dual Display Docking Station, but (as you mentioned) you’ll need a couple adapters to accomplish that. Normally, we’d suggest that you purchase an HDMI to VGA Converter Cable (like the one linked below) for the HDMI port on the dock.

Then you can use the included VGA to DVI adapter that came with the docking station in order to connect the second VGA monitor.

In regards to the adapter you purchased, can you please confirm the brand and specific model so we can look into that with you further? That information will be very helpful.

Thank You,

Plugable Technologies

Hi Amanda,

The guy at Best Buy stated that if I didn’t have a HDMI monitor, that I needed to use the USB adapter. He sold me an Insignia USB to VGA Adapter NS-PU96203.… Is an adapter such as this suppose to work? If so, is there something I need to do on the pc to make it work?

So you are saying I can connect my VGA monitor to the HDMI port, correct? Would the following adapter also work? I don’t need such a long cable as the one your suggesting. Or does Plugable sell just the adapter without the long cable?…


Hi Amanda,

Looking closer at the cable you suggested, it has a male VGA end. My monitor has a male VGA end, so I would need an adapter with a female VGA on one end and HDMI on the other. Like the one I put in my last reply.…

Will this one work?


Hi Greta,

Unfortunately, the Best Buy representative you spoke to was incorrect. A USB 3.0 graphics adapter is not necessary in order to adapt your VGA display to work with either the HDMI or DVI ports on the back of our docking station. In fact, it renders the docking station redundant.

The HDMI to VGA converter cable I linked you to earlier would connect to the back of your VGA monitor directly, then plug into the HDMI port on the back of the docking station with no other adapters or cables involved. Since this cable is our own brand, we’ve thoroughly tested it with our docking station and a VGA monitor like yours.

While the adapter you linked to might also work for adapting one of your VGA displays to HDMI, we’ve not tested that specific brand with our docking station, so we can’t guarantee it will work well with our dock.

Your other VGA monitor can be adapted to a DVI connection with the VGA to DVI adapter that was included in the box with your docking station.

We hope this information helps. Please let us know if you have any other questions.


Plugable Support