Been here, done that. Here are my notes. Just holler if you need more explanation:
Problems with blank display after power cycling TV
switch to console mode: Alt+Ctrl+F1
kill x server: sudo service lightdm stop
generate new xorg.conf file: sudo X -configure -- this will create xorg.conf.new file in your current dir
rename and move: sudo mv xorg.conf.new /etc/X11/xorg.conf
Edit /etc/X11/xorg.conf and add this line to device section:
Option "Hotplug" "false"
On the downside, I suppose this means the drivers will not be able to adjust resolution if you connect a different type of display device on-the-fly. Not a practical issue as far as I'm concerned.