Linux Mint - 3 Monitor Setup - 3rd Not working

I have 2 nvidia graphics cards, 1 GTX 670 and 1 GTC 550ti. The two monitors that are on the 670 are working fine but the 3rd one on the 550, is not. 2 monitors are running off of a DVI to HDMI adapter cable and the 3rd is HDMI. I have included a screenshot of the nvidia-settings and xorg.

Large: http://i.imgur.com/vK45k8v.png

xorg

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 331.20  (buildd@roseapple)  Mon Feb  3 15:07:22 UTC 2014


Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    Screen      1  "Screen1" RightOf "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
    Option         "Xinerama" "0"
EndSection

Section "Files"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"

    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Samsung S27C570"
    HorizSync       30.0 - 81.0
    VertRefresh     50.0 - 75.0
    Option         "DPMS"
EndSection

Section "Monitor"
    Identifier     "Monitor1"
    VendorName     "Unknown"
    ModelName      "Samsung S27B350"
    HorizSync       0.0 - 0.0
    VertRefresh     0.0
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 670"
    BusID          "PCI:1:0:0"
EndSection

Section "Device"
    Identifier     "Device1"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 550 Ti"
    BusID          "PCI:2:0:0"
EndSection

Section "Screen"

# Removed Option "metamodes" "GPU-63a5ad13-9307-7a00-a4b2-9fa549caf6d5.DVI-I-1: nvidia-auto-select +0+0, GPU-63a5ad13-9307-7a00-a4b2-9fa549caf6d5.DVI-D-0: nvidia-auto-select +1920+0, GPU-439aadae-13a8-7cab-0f2e-4e0afbf0403c.DVI-I-3: nvidia-auto-select +3840+0"
# Removed Option "SLI" "off"
# Removed Option "BaseMosaic" "on"
# Removed Option "metamodes" "DVI-I-1: nvidia-auto-select +0+0, DVI-D-0: nvidia-auto-select +1920+0"
# Removed Option "SLI" "Off"
# Removed Option "BaseMosaic" "off"
# Removed Option "metamodes" "GPU-63a5ad13-9307-7a00-a4b2-9fa549caf6d5.DVI-I-1: nvidia-auto-select +0+0, GPU-63a5ad13-9307-7a00-a4b2-9fa549caf6d5.DVI-D-0: nvidia-auto-select +1920+0, GPU-439aadae-13a8-7cab-0f2e-4e0afbf0403c.DVI-I-3: nvidia-auto-select +3840+0"
# Removed Option "SLI" "off"
# Removed Option "BaseMosaic" "on"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "nvidiaXineramaInfoOrder" "DFP-3"
    Option         "metamodes" "DVI-I-1: nvidia-auto-select +0+0, DVI-D-0: nvidia-auto-select +1920+0"
    Option         "SLI" "Off"
    Option         "MultiGPU" "Off"
    Option         "BaseMosaic" "off"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Section "Screen"
    Identifier     "Screen1"
    Device         "Device1"
    Monitor        "Monitor1"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "metamodes" "nvidia-auto-select +0+0"
    Option         "SLI" "Off"
    Option         "MultiGPU" "Off"
    Option         "BaseMosaic" "off"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

500+ views and no replies.....

You think that this line has anything to do with it?

Option "MultiGPU" "Off"

Originally Posted by EDDY1 You think that this line has anything to do with it?

Doesn't seem to effect it. Once I do get it to work, it seems as if I get a new desktop but with mdm not running. If I disable the third monitor, its fine and I use the desktop

Section "Monitor"
    Identifier     "Monitor1"
    VendorName     "Unknown"
    ModelName      "Samsung S27B350"
    HorizSync       0.0 - 0.0
    VertRefresh     0.0
EndSection

That does not look right. I would try commenting out those lines.