This issue is commonly caused by the screen resolution settings in Ubuntu becoming too high for the actual monitor. This guide is written with the Ubuntu Live CD and version 12.10 in mind.
- During start-up select your language when prompted.
- Press F6 (Other Options)
- At the end of the command line type: vga=791
- Press Enter
Ubuntu should now boot with a resolution of 1024 by 768 (32bit). Click “here” for a Wikipedia link to other Video display choices.
If that doesn’t work:
Start the Live CD process
- Unplug the VGA port for the monitor for about 5 minutes – allowing Ubuntu to properly start.
- Plug the monitor back in and Ubuntu should automatically select the right resolution and display.