why is my inside display not lighting up on my berlingo?

Could be the bulb(s), but normally the display will gradually dim as first one bulb goes, then another will go etc.

If it has just stopped working suddenly, then if it is not the bulbs that have blown I'd check the connector has not come adrift or loose.

Also see:
http://www.berlingoforum.co.uk/showthread.php?tid=2119

ChicksFan
April 2012