You can do the start, stop and find the status of Oracle Enterprise Manager Console as following,
Windows
If you are in Windows environment, open the Services (services.msc) and locate the service name, OracleDBConsoleORACLE_SID – In this example, the OracleDBConsoleELY. You can do the start and stop from the left panel and find the state from the Status column.
UNIX, Linux
For UNIX or Linux operating environment, use the following commands,
Firstly, go to ORACLE_HOME/bin directory.
To start,
./emctl start dbconsole
To stop,
./emctl stop dbconsole
To get status,
./emctl status dbconsole
