How to add a 2nd monitor to HP port replicatior with USB to VGA adapter.

Have a HP 450 G3 laptop (win 7 pro) and I purchased a HP usb 3.0 port replicator.  The user wants to ulilize 2 monitors all coming out of the replicator (none from the laptop) so they have the laptop screen, and 2 other monitors connected to the replicator.  The connection used for the 1st screen is a HDMI to DVI adapter.  The user connected this to the replicator and it worked.  Laptop screen, 2nd monitor working fine.  Then I sent him a startech usb to VGA adapter so he could have 2 monitors coming out of the replicator.  When he plugged it in he lost the monitor that was plugged into the HDMI port on the replicator.  Does anyone know if you can use a usb to vga adapter on a HP port relicator to add a 2nd monitor?  Or is there another way with this replicator that I can get 2 monitors connected to it?  The replicatior has 6 usb ports and 1 hdmi port and a display port.  Can I use the display port and connect to a monitor that has a vga or dvi connection?
mkramer777Asked:
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Steven CarnahanNetwork ManagerCommented:
We recently looked into having two monitors plus the laptop monitor and found that it was dependent on the video card that was in the laptop.  Some video cards only allow 2 monitors total.
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Steven CarnahanNetwork ManagerCommented:
I did some checking and it appears that the HP 450 G3 has the same limitations that we had with our Lenovo T520 and older laptops.  You are limited to 2 monitors.  It looks like the 650 might have the ability built in to have two external and the laptop screen all working at the same time.
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