Ok, I tried doing something I found in the Ubuntu community documentation here:
https://help.ubuntu.com/community/NvidiaTVOut
It didn't work, however, though it's certainly possible that I just did something wrong. I'll post the xorg.conf file below with the changes that I made to it in red. This is from a backup I made of the edited file before I reverted to the backup I made of the original. I had to undo the changes I made to xorg.conf because after I rebooted, not only did the external monitor not display but the laptop monitor switched to look-like-crap mode. I hope someone can point out what I did wrong now that I've got the xorg.conf file up.
=====================================================================
# xorg.conf (xorg X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the xorg.conf manual page.
# (Type "man xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
# sudo dpkg-reconfigure -phigh xserver-xorg
Section "Files"
EndSection
Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "CoreKeyboard"
Option "XkbRules" "xorg"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"
EndSection
Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
Option "CorePointer"
Option "Device" "/dev/input/mice"
Option "Protocol" "ImPS/2"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "true"
EndSection
Section "InputDevice"
Identifier "Synaptics Touchpad"
Driver "synaptics"
Option "SendCoreEvents" "true"
Option "Device" "/dev/psaux"
Option "Protocol" "auto-dev"
Option "HorizEdgeScroll" "0"
EndSection
Section "InputDevice"
Driver "wacom"
Identifier "stylus"
Option "Device" "/dev/input/wacom"
Option "Type" "stylus"
Option "ForceDevice" "ISDV4"# Tablet PC ONLY
EndSection
Section "InputDevice"
Driver "wacom"
Identifier "eraser"
Option "Device" "/dev/input/wacom"
Option "Type" "eraser"
Option "ForceDevice" "ISDV4"# Tablet PC ONLY
EndSection
Section "InputDevice"
Driver "wacom"
Identifier "cursor"
Option "Device" "/dev/input/wacom"
Option "Type" "cursor"
Option "ForceDevice" "ISDV4"# Tablet PC ONLY
EndSection
Section "Device"
Identifier "nVidia Corporation G70 [GeForce Go 7800]"
Driver "nvidia"
Busid "PCI:1:0:0"
Option "AddARGBVisuals" "True"
Option "AddARGBGLXVisuals" "True"
Option "NoLogo" "True"
Option "ConnectedMonitor" "LCD, TV"
EndSection
Section "Monitor"
Identifier "Generic Monitor"
Option "DPMS"
Horizsync 28-72
Vertrefresh 43-60
EndSection
Section "Screen"
Identifier "Default Screen"
Device "nVidia Corporation G70 [GeForce Go 7800]"
Monitor "Generic Monitor"
Defaultdepth 24
SubSection "Display"
Modes "1440x900"
Option "TwinView"
Option "TVOutFormat" "DVI"
Option "TVStandard" "NTSC-M"
Option "MetaModes" "1920x1080,800x600; 1440x900,NULL; 1024x768,NULL; 800x600,NULL; 640x480,NULL"
Subsection "Display"
Modes "1920x1080" "1440x900" "800x600"
EndSubSection
EndSection
Section "ServerLayout"
Identifier "Default Layout"
screen "Default Screen"
Inputdevice "Generic Keyboard"
Inputdevice "Configured Mouse"
# Uncomment if you have a wacom tablet
# InputDevice "stylus" "SendCoreEvents"
# InputDevice "cursor" "SendCoreEvents"
# InputDevice "eraser" "SendCoreEvents"
Inputdevice "Synaptics Touchpad"
EndSection
Section "Module"
Load "glx"
EndSection