Question : Active Administrator Agent

Recieving this error on our DC. IT is windows 2003 Sp3. Server has rebooted twice no with no cause that I can see expept this error... Any idea.

CActiveAdministratorAgent::DoAgentWork - Unable to open the database.
[DBNETLIB][ConnectionOpen (Connect()).]SQL Server does not exist or access denied.
Error = -2147467259.

Answer : Active Administrator Agent

Looks like the issue was a bad array card. Replaced and server has been fine since.