Have you tried the following already ?
<li>Check the Login account for the service and if it using a user account make sure you have the right password stored in there. </li><li>Check the Application/System logs. What error messages do you see there ?</li><li>Has anything changed recently on your server ? Upgrades etc ?</li><li>What version/edition of SQL Server are you running ?</li><li>Are you seeing any other issues/problems with SQL ? </li>
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