Some times when login to the plesk panel we may get the following error:
Log file 'C:\DATABASEMSSQL\psa_Log.LDF' does not match the primary file. It may be from a different database or the log may have been rebuilt previously.
The reason for this is either database or log files were corrupted. We can solve the issue by restoring the plesk database from the backup.
To restore psa database go to MSSQL Server Management Studio->click on Databases->right click->restore database.