I beg your pardon my English is terrible
Hi, I have the triple screen and the image displayed on the three-projector. Images from the Projector go without distortion, but when connected to the first display is running Matrox MGA 2164W Millennium II from VNC, I can see horizontal lines across screen. When you connect to other screens, this error does not.

And Information about system:
# cat /etc/redhat-release
CentOS release 5.8 (Final)

# uname -a
Linux potolok 2.6.18-308.11.1.el5 #1 SMP Tue Jul 10 08:49:28 EDT 2012 i686 i686 i386 GNU/Linux


# lspci -nn | grep VGA
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation NV5M64 [RIVA TNT2 Model 64/Model 64 Pro] [10de:002d] (rev 15)
02:01.0 VGA compatible controller [0300]: Matrox Graphics, Inc. MGA 2164W [Millennium II] [102b:051b]
02:02.0 VGA compatible controller [0300]: Matrox Graphics, Inc. MGA 2164W [Millennium II] [102b:051b]

Xorg:
Code:
Section "ServerLayout"
        Identifier     "X.org Configured"
        Screen      0  "Screen0" 0 0
        Screen      1  "Screen1" RightOf "Screen0"
        Screen      2  "Screen2" RightOf "Screen1"
        InputDevice    "Mouse0" "CorePointer"
        InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"

        ModulePath   "/usr/lib/xorg/modules"
        FontPath     "unix/:7100"
        FontPath     "built-ins"
        FontPath         "/usr/share/X11/fonts"
EndSection

Section "Module"
        Load  "extmod"
        Load  "glx"
        Load  "dri"
        Load  "xtrap"
        Load  "dbe"
        Load  "record"
        Load  "vnc"
        Load  "freetype"
EndSection

Section "InputDevice"
        Identifier  "Keyboard0"
        Driver      "kbd"
#       Option          "CoreKeyboard"
#       Option      "XkbModel" "pc105"
#       Option      "XkbLayout" "us"
EndSection

Section "InputDevice"
        Identifier  "Mouse0"
        Driver      "mouse"
        Option      "Protocol" "auto"
        Option      "Device" "/dev/input/mice"
        Option      "ZAxisMapping" "4 5 6 7"
EndSection

Section "Modes"
  Identifier   "Modes[0]"
  Modeline "1024x768_75"   78.80  1024 1040 1136 1312  768 769 772 800 +hsync +vsync
  Modeline "1024x768_85"   94.50  1024 1072 1168 1376  768 769 772 808 +hsync +vsync
EndSection

Section "Monitor"
        #DisplaySize      300   230     # mm
        Identifier   "Monitor0"
        VendorName   "IBM"
        ModelName    "IBM L150"
 ### Comment all HorizSync and VertSync values to use DDC:
        HorizSync    30.0 - 61.0
        VertRefresh  56.0 - 75.0
        Option      "DPMS"
EndSection

Section "Monitor"
        #DisplaySize      300   230     # mm
        Identifier   "Monitor1"
        VendorName   "ADE"
        ModelName    "ADE3800XT-LCD"
        Option      "DPMS"
EndSection

Section "Monitor"
        #DisplaySize      360   300     # mm
        Identifier   "Monitor2"
        VendorName   "LEN"
        ModelName    "LEN L171p"
 ### Comment all HorizSync and VertSync values to use DDC:
        HorizSync    30.0 - 81.0
        VertRefresh  56.0 - 76.0
        Option      "DPMS"
EndSection

Section "Device"
        ### Available Driver options are:-
        ### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
        ### <string>: "String", <freq>: "<f> Hz/kHz/MHz"
        ### [arg]: arg optional
        #Option     "SWcursor"                  # [<bool>]
        #Option     "HWcursor"                  # [<bool>]
        #Option     "NoAccel"                   # [<bool>]
        #Option     "ShadowFB"                  # [<bool>]
        #Option     "UseFBDev"                  # [<bool>]
        #Option     "Rotate"                    # [<str>]
        #Option     "VideoKey"                  # <i>
        #Option     "FlatPanel"                 # [<bool>]
        #Option     "FPDither"                  # [<bool>]
        #Option     "CrtcNumber"                # <i>
        #Option     "FPScale"                   # [<bool>]
        #Option     "FPTweak"                   # <i>
        #Option     "DualHead"                  # [<bool>]
        Identifier  "Card0"
        Driver      "nv"
        VendorName  "nVidia Corporation"
        BoardName   "NV5M64 [RIVA TNT2 Model 64/Model 64 Pro]"
        BusID       "PCI:1:0:0"
EndSection

Section "Device"
        ### Available Driver options are:-
        ### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
        ### <string>: "String", <freq>: "<f> Hz/kHz/MHz"
        ### [arg]: arg optional
        #Option     "SWcursor"                  # [<bool>]
        #Option     "HWcursor"                  # [<bool>]
        #Option     "PciRetry"                  # [<bool>]
        #Option     "SyncOnGreen"               # [<bool>]
        #Option     "NoAccel"                   # [<bool>]
        #Option     "ShowCache"                 # [<bool>]
        #Option     "MGASDRAM"                  # [<bool>]
        #Option     "ShadowFB"                  # [<bool>]
        #Option     "UseFBDev"                  # [<bool>]
        #Option     "ColorKey"                  # <i>
        #Option     "SetMclk"                   # <freq>
        #Option     "OverclockMem"              # [<bool>]
        #Option     "VideoKey"                  # <i>
        #Option     "Rotate"                    # [<str>]
        #Option     "TexturedVideo"             # [<bool>]
        #Option     "Crtc2Half"                 # [<bool>]
        #Option     "Crtc2Ram"                  # <i>
        #Option     "Int10"                     # [<bool>]
        #Option     "AGPMode"                   # <i>
        #Option     "AGPSize"                   # <i>
        #Option     "DigitalScreen1"            # [<bool>]
        #Option     "DigitalScreen2"            # [<bool>]
        #Option     "TV"                        # [<bool>]
        #Option     "TVStandard"                # [<str>]
        #Option     "CableType"                 # [<str>]
        #Option     "NoHal"                     # [<bool>]
        #Option     "SwappedHead"               # [<bool>]
        #Option     "DRI"                       # [<bool>]
        #Option     "MergedFB"                  # [<bool>]
        #Option     "Monitor2HSync"             # [<str>]
        #Option     "Monitor2VRefresh"          # [<str>]
        #Option     "Monitor2Position"          # [<str>]
        #Option     "MetaModes"                 # [<str>]
        #Option     "OldDmaInit"                # [<bool>]
        #Option     "ForcePciDma"               # [<bool>]
        #Option     "AccelMethod"               # [<str>]
        #Option     "KVM"                       # [<bool>]
        Identifier  "Card1"
        Driver      "mga"
        VendorName  "Matrox Graphics, Inc."
        BoardName   "MGA 2164W [Millennium II]"
        BusID       "PCI:2:1:0"
EndSection

Section "Device"
        ### Available Driver options are:-
        ### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
        ### <string>: "String", <freq>: "<f> Hz/kHz/MHz"
        ### [arg]: arg optional
        #Option     "SWcursor"                  # [<bool>]
        #Option     "HWcursor"                  # [<bool>]
        #Option     "PciRetry"                  # [<bool>]
        #Option     "SyncOnGreen"               # [<bool>]
        #Option     "NoAccel"                   # [<bool>]
        #Option     "ShowCache"                 # [<bool>]
        #Option     "MGASDRAM"                  # [<bool>]
        #Option     "ShadowFB"                  # [<bool>]
        #Option     "UseFBDev"                  # [<bool>]
        #Option     "ColorKey"                  # <i>
        #Option     "SetMclk"                   # <freq>
        #Option     "OverclockMem"              # [<bool>]
        #Option     "VideoKey"                  # <i>
        #Option     "Rotate"                    # [<str>]
        #Option     "TexturedVideo"             # [<bool>]
        #Option     "Crtc2Half"                 # [<bool>]
        #Option     "Crtc2Ram"                  # <i>
        #Option     "Int10"                     # [<bool>]
        #Option     "AGPMode"                   # <i>
        #Option     "AGPSize"                   # <i>
        #Option     "DigitalScreen1"            # [<bool>]
        #Option     "DigitalScreen2"            # [<bool>]
        #Option     "TV"                        # [<bool>]
        #Option     "TVStandard"                # [<str>]
        #Option     "CableType"                 # [<str>]
        #Option     "NoHal"                     # [<bool>]
        #Option     "SwappedHead"               # [<bool>]
        #Option     "DRI"                       # [<bool>]
        #Option     "MergedFB"                  # [<bool>]
        #Option     "Monitor2HSync"             # [<str>]
        #Option     "Monitor2VRefresh"          # [<str>]
        #Option     "Monitor2Position"          # [<str>]
        #Option     "MetaModes"                 # [<str>]
        #Option     "OldDmaInit"                # [<bool>]
        #Option     "ForcePciDma"               # [<bool>]
        #Option     "AccelMethod"               # [<str>]
        #Option     "KVM"                       # [<bool>]
        Identifier  "Card2"
        Driver      "mga"
        VendorName  "Matrox Graphics, Inc."
        BoardName   "MGA 2164W [Millennium II]"
        BusID       "PCI:2:2:0"
EndSection

Section "Screen"
        Identifier "Screen0"
        Device     "Card0"
        Monitor    "Monitor0"
        DefaultDepth 16
        SubSection "Display"
                Viewport   0 0
                Depth     1
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     4
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     8
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     15
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     16
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     24
        EndSubSection
        Option "SecurityTypes" "VncAuth"
        Option "UserPasswdVerifier" "VncAuth"
        Option "PasswordFile" "/root/.vnc/passwd"
EndSection

Section "Screen"
        Identifier "Screen1"
        Device     "Card1"
        Monitor    "Monitor1"
        DefaultDepth 16
        SubSection "Display"
                Viewport   0 0
                Depth     1
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     4
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     8
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     15
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     16
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     24
        EndSubSection
        Option "SecurityTypes" "VncAuth"
        Option "UserPasswdVerifier" "VncAuth"
        Option "PasswordFile" "/root/.vnc/passwd"
EndSection

Section "Screen"
        Identifier "Screen2"
        Device     "Card2"
        Monitor    "Monitor2"
        DefaultDepth 16
        SubSection "Display"
                Viewport   0 0
                Depth     1
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     4
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     8
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     15
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     16
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     24
        EndSubSection
        Option "SecurityTypes" "VncAuth"
        Option "UserPasswdVerifier" "VncAuth"
        Option "PasswordFile" "/root/.vnc/passwd"
EndSection
If you need any more information please report it and I'll post it