I have nVidia GTS 450 on Asus Z97 motherboard. Today I bought a new screen, so in total I have three now - two 27 are connected to the GTS 450 card and one 20 is connected to the motherboard output. The big screens are both working, but I can't figure out how to make the small screen - attached to the motherboard - work.I'm running gdm3 and couldn't find anything in the gui config apps. Would a reinstall of proprietary graphic drivers come in handy?UpdateMy xorg.conf:# nvidia-xconfig: X configuration file generated by nvidia-xconfig# nvidia-xconfig:  version 340.65  (buildmeister@swio-display-x64-rhel04-11)  Tue Dec  2 09:59:38 PST 2014Section ServerLayout    Identifier     Layout0    Screen      0  Screen0 0 0    InputDevice    Keyboard0 CoreKeyboard    InputDevice    Mouse0 CorePointerEndSectionSection FilesEndSectionSection InputDevice    # generated from default    Identifier     Mouse0    Driver         mouse    Option         Protocol auto    Option         Device /dev/psaux    Option         Emulate3Buttons no    Option         ZAxisMapping 4 5EndSectionSection InputDevice    # generated from default    Identifier     Keyboard0    Driver         kbdEndSectionSection Monitor    Identifier     Monitor0    VendorName     Unknown    ModelName      Unknown    HorizSync       28.0 - 33.0    VertRefresh     43.0 - 72.0    Option         DPMSEndSectionSection Device    Identifier     Device0    Driver         nvidia    VendorName     NVIDIA CorporationEndSectionSection Screen    Identifier     Screen0    Device         Device0    Monitor        Monitor0    DefaultDepth    24    SubSection     Display        Depth       24    EndSubSectionEndSectionAnd that's pretty much it
Triple monitors on Debian wheezy
xorg