Undo changes

I load 8.10 ubuntu, was working good, got new monitor AOC, changed monitor type and can't get into my desktop anymore, I reinstalled and same thing...got to log on screen and then only mouse and a blank desktop.
Please any ideas?



: New Monitor; No Video on boot
Shooting fr the hip:

CTRL+ALT+BACKSPACE to drop out to a "real" terminal & make a backup of your existing config:
sudo cp /etc/X11/xorg.conf xorg.conf.nonworkingbackup
reconfigure X11:
dpkg -reconfigure xserver-xorg

The monitor's manual should state the required info for input. Haven't done this in a while, so your mileage may vary.

ps/ pls consider more descriptive title to help those that come after us.