lm_sensors should have put the sensor modules in "/etc/modules"; at least
that's where they are on my Dapper machine at the office. You can try
commenting out (#) all or some of the modules that are being loaded.

You'll have to edit via a terminal using sudo:

sudo gedit /etc/modules

Then reboot or unload the modules using modprobe

sudo modprobe -r module-name

Then restart X:

logout, then use "CTL-ALT-Backspace" to restart X.

Rebooting may be easier.

Your hardware may not be supported or a module was loaded that really
screwed your video up.