Type the command from the <BASEDIR>/smarts/bin directory:
./sm_service start <service_name> [<service_name> ...]
where <service_name> is the service you need to start.
Additionally, you can check the sm_notify_en_US_UTF-8.log present in the <BASEDIR>/local/logs folder or use the sm_getinfo utility to collect data to help troubleshoot the problem.
The VMware Smart Assurance Installation Guide for SAM, IP, ESM, MPLS, and NPM Managers provides details for using the sm_getinfo utility.