Thread:Project:Support desk/(Can't contact the database server: Unknown database 'wikidb' (localhost))

This problem suddenly appeared on my wiki. http://wiki.davidawright.co.uk. Running on a QNAP NAS box with mediawiki 1.16.1, QNAP server 3.8.3, MySQL Server version: 5.1.36-log phpMyAdmin 3.3.5 shows three databases as follows

information_schema (28) mysql (23) test

Can I "find" my wikidb again. Should I re-install mediawiki? Help!