If SQL Server agent not started and if you find below error in event viewer
Error Details
Log Name : Application
Source : SQLSERVERAGENT
Date : 8/8/2017 3:49:43 PM
Event ID : 103
Task Category : Service
Control
Level :
Error
Keywords : Classic
User :
N/A
Computer :
VmSQLServer
Description :
SQLServerAgent could not be
started (reason: Unable to connect to server '(local)'; SQLServerAgent cannot
start).
Solution
Provide instance in in "ServerHost" under
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\MSSQL12.MSSQLSERVER\SQLServerAgent
Goto run
type regedit
expand HKEY_LOCAL_MACHINE --> SOFTWARE --> Microsoft --> Microsoft SQL Server
click on SQLServerAgent in Microsoft SQL Server
In right side pane double click on ServerHost and provide instance name under value data
