The most probable cause is that your MySQL database has been corrupt. There was an unexpected system shutdown at 17:30 on 3/6/2012.
You can try to fix the database. See here: https://forum.team-mediaportal.com/...d-possible-to-repair.71699/page-2#post-793133
You can try to fix the database. See here: https://forum.team-mediaportal.com/...d-possible-to-repair.71699/page-2#post-793133