diff --git a/setdisplay b/setdisplay
index 6efd903..7e519d5 100755
--- a/setdisplay
+++ b/setdisplay
@@ -1,17 +1,36 @@
 #!/bin/bash
 
-# TODO: Am I calling them displays or video outputs? Pick one!
 function call_xrandr() {
     xrandr_opts=''
 
-    for output in "${!video_outputs[@]}"; do
-        echo "Setting ${output} to ${video_outputs[$output]}"
-        xrandr_opts="${xrandr_opts} --output ${output} ${video_outputs[$output]}"
+    for display in "${!display_configurations[@]}"; do
+        echo "Setting ${display} to ${display_configurations[$display]}"
+        xrandr_opts="${xrandr_opts} --output ${display} ${display_configurations[$display]}"
     done
 
+    # Word splitting here is important, so it's not in quotes.
     xrandr $xrandr_opts
 }
 
+function display_config() {
+    display_name="$1"
+    display_config="$2"
+
+    if [[ ${display_configurations[$display_name]} = '' ]]; then
+        echo "Tried to configure invalid display ${display_name}."
+        exit 1
+    fi
+
+    if [[ ${connected_displays[$display_name]} != 'yes' ]]; then
+        echo "Tried to configure disconnected display ${display_name}."
+        exit 1
+    fi
+
+    display_configurations[$display_name]="$display_config"
+}
+
+declare -A display_configurations
+declare -A connected_displays
 
 if [ "$1" = '-a' ]; then
     switch_audio='yes'
@@ -20,35 +39,39 @@ else
     video_mode="$1"
 fi
 
-declare -A video_outputs
 
 while read -r display_line; do
     display_name="$(echo "$display_line" | cut -d " " -f 1)"
-    video_outputs[$display_name]=' --off'
+
+    if [[ "$(echo "$display_line" | cut -d " " -f 2)" = 'connected' ]]; then
+        connected_displays[$display_name]='yes'
+    else
+        connected_displays[$display_name]='no'
+    fi
+
+    display_configurations[$display_name]=' --off'
 done <<< "$(xrandr | grep connected)"
 
-# TODO: I'm kind of inattentive, so build in a mechanism to make sure the display I try
-#   to use is actually connected.
-# TODO: I'm also very lazy, so build a method that automatically figures out which HDMI
+# TODO: I'm very lazy, so build a method that automatically figures out which HDMI
 #   output to use if there's only one.
 case $video_mode in
     'lvds-hdmi1')
-        video_outputs['LVDS1']='--primary --mode 1366x768'
-        video_outputs['HDMI1']='--mode 1280x720 --above LVDS1'
+        display_config 'LVDS1' '--primary --mode 1366x768'
+        display_config 'HDMI1' '--mode 1280x720 --above LVDS1'
 
         if [ "$switch_audio" = 'yes' ]; then
             audio_profile='output:hdmi-stereo'
         fi
         ;;
     'hdmi1')
-        video_outputs['HDMI1']='--primary --mode 1280x720'
+        display_config 'HDMI1' '--primary --mode 1280x720'
 
         if [ "$switch_audio" = 'yes' ]; then
             audio_profile='output:hdmi-stereo'
         fi
         ;;
     'lvds')
-        video_outputs['LVDS1']='--primary --mode 1366x768'
+        display_config 'LVDS1' '--primary --mode 1366x768'
         if [ "$switch_audio" = 'yes' ]; then
             audio_profile='output:analog-stereo'
         fi
@@ -56,7 +79,7 @@ case $video_mode in
 
     # This is intended to be a quick rescue mode.
     '') 
-        video_outputs['LVDS1']='--primary --mode 1366x768'
+        display_config 'LVDS1' '--primary --mode 1377x768'
         audio_profile='output:analog-stereo'
         ;;
     *)
@@ -65,7 +88,7 @@ case $video_mode in
         ;;
 esac
 
-call_xrandr "${video_outputs[@]}"
+call_xrandr
 if [ "$switch_audio" = 'yes' ]; then
     ponymix -c 0 set-profile "${audio_profile}"
 fi