I tried to change over to gnome desktop with not much success, so I reverted back to Unity desktop. When I did so, a number of issues occurred. 1) Colour of top taskbar has changed 2) Key mappings, in particular, mouse settings were changed. 3) When I go to full display on my external monitor, 1920x1080, the background image/display does not sync to the full display. Eventually I have managed to get a blank display but with no background image.
For 3), tried reinstalling the nvidia drivers, did nothing. Is this a cache issue? At a loss on how revert to my old background.
Hardware platform is a Dell XPS M1330 with a NVIDA GeForce 8400M video card connected via VGA cable to a Dell S2440L monitor. I have to use the monitor given the fact my XPS laptop display is not functioning correctly.