You have a database in MS SQL that is tagged as (suspect) and you are unable to connect to the database.
The database could have become corrupted.
There is not enough space available for the SQL Server to recover the
database during startup.
The database cannot be opened due to inaccessible files or
insufficient memory or disk space.
The database files are being held by operating system, third party
backup software etc.
There was an unexpected SQL Server Shutdown, power failure or a
Open Microsoft SQL Server Management Studio and connect to your database
Click the New Query button
Paste the following SQL script into your New Query page replacing [YourDatabase] with the name of your database.
EXEC sp_resetstatus [YourDatabase];
ALTER DATABASE [YourDatabase] SET EMERGENCY
ALTER DATABASE [YourDatabase] SET SINGLE_USER WITH ROLLBACK IMMEDIATE
DBCC CheckDB ([YourDatabase], REPAIR_ALLOW_DATA_LOSS)
ALTER DATABASE [YourDatabase] SET MULTI_USER
Source : https://support.appzone.com/kb/a398/how-to-repair-a-suspect-database-in-mssql.aspx