Blackburn? Used to work out that way a few years back.
This link tells tyou how to remove the dash
Pelican Technical Article: Boxster 996 Gauge Cluster Upgrade - 986 Boxster (1997-04) -
I'd try unplugging the battery, and disconnecting and re-seating the connectors at the rear first.
Let me know what colour of connectors you have and if you can't get the problem fixed this way, I can lend you a dash to swap out and see if that fixes the problem.
Regards