Display shows 72" toshiba but is only 32"

linux 17.2 cinnamon 64 bit , 2.6.13; kernel 3.19.0-18 generic; processor i7 2600k @ 3.40 GHz x 4; ram 8 gb; nvidia GTX 770.
Display shows a 72 inch toshiba but it is only a 32 inch; connection is with HDMI; so i change xorg.
# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 352.21 (buildmeister@swio-display-x64-rhel04-13) Tue Jun 9 22:44:03 PDT 2015

Section "ServerLayout"
    Identifier "Layout0"
    Screen 0 "Screen0" 0 0
    InputDevice "Keyboard0" "CoreKeyboard"
    InputDevice "Mouse0" "CorePointer"
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"
    Identifier "Monitor0"
    ModelName "Toshiba 32C120U"
    HorizSync 24.0 - 94.0
    VertRefresh 24.0 - 87.0
    Option "DPMS"
EndSection

Section "Device"
    Identifier "Device0"
    Driver "nvidia"
    Option "UseEDIDFreqs" "false"
    Option "UseEDIDDpi" "false"
    VendorName "NVIDIA Corporation"
EndSection

Section "Screen"
    Identifier "Screen0"
    Device "Device0"
    Monitor "Monitor0"
    DefaultDepth 24
    Option "DPI" "69 x 69"
    SubSection "Display"
        Depth 24
    EndSubSection
EndSection

but no change on Display, what else can i do? Thank you for any help i can get ; please go easy on me i'm new to all of this