I'm using Ubuntu 8.10 and dual-monitoring on a laptop using a rather cheap monitor connected to it via VGA. However, all of a sudden my laptop screen went glitchy displaying odd black and white glitch (it would display the mouse pointer though). I tried fixing it but ended up having to shut the computer down.

When the computer had restarted, one screen stretched over both monitors and I couldn't detect the extra monitor in the "Screen resolution". It displays the laptop's monitors as "Unknown" and there are more choices for screen resolution than there used to be. (I have tried to disconnect the monitor btw, but nothing seems to work)

Originally Ubuntu detected the monitor right away and it worked perfectly, is there any way to reset the monitor settings? Currently both monitors display the same thing, and there really isn't much help in that now is there

what graphics card do you have in your laptop?

Go to System -> Administration -> Hardware Drivers to see which driver is in use.

I'm not certain but I've seen that when proprietary driver in use screens come as "Unknown".

No, never mind people
I simply went to /etc/X11 and replaced xorg.conf with a backup file I'd made some time ago

Sorry for posting this when I could work it out myself