MiniDisplay to DVI on Mac Pro

I recently bought a refurbished Mac Pro (4,1) 2.93ghz Quad core and I'm trying to get 2 monitors working with it like I had with my G5. The problem is that I cannot get either monitor to work with the Minidisplay port. I've tried using a MDP to VGA adapter and also tried a MDP to DVI adapter since both monitors have both connections. No luck. With the VGA adapter the Mac doesn't even see the monitor and with the DVI adapter it sees the monitor but I get no video. Is there a trick I'm missing to get a monitor to work with the MDP? The DVI port on the video card works fine with both monitors. Also, the Mac is running 10.9.
Thanks,
Dan

Here's what it says:
Chipset Model:          NVIDIA GeForce GT 120
  Type:          GPU
  Bus:          PCIe
  Slot:          Slot-1
  PCIe Lane Width:          x16
  VRAM (Total):          512 MB
  Vendor:          NVIDIA (0x10de)
  Device ID:          0x0640
  Revision ID:          0x00a1
  ROM Revision:          3386
  Displays:
SDM-HS95P:
  Resolution:          1280 x 1024
  Pixel Depth:          32-Bit Color (ARGB8888)
  Display Serial Number:          6383889
  Mirror:          On
  Mirror Status:          Hardware Mirror
  Online:          Yes
  Rotation:          Supported
VX2235wm:
  Resolution:          1680 x 1050 @ 60 Hz
  Pixel Depth:          32-Bit Color (ARGB8888)
  Display Serial Number:          QSD073922794
  Main Display:          Yes
  Mirror:          On
  Mirror Status:          Master Mirror
  Online:          Yes
  Rotation:          Supported

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