In System Center 2012 R2 Operations Manager (OpsMgr 2012 R2), the Microsoft Monitoring Agent service, also known as HealthService.exe, may get stuck in the Starting state in Service Control Manager. In this scenario, you can't stop the service through Service Control Manager or by using a command prompt, and if you manually end the HealthService.exe process in Task Manager and then try to restart the service, the problem recurs.
For complete details as well as a resolution, please see the following:
KB3058405 - Microsoft Monitoring Agent Service freezes during the startup process (https://support.microsoft.com/en-us/kb/3058405/)
J.C. Hornbeck| Solution Asset PM | Microsoft GBS Management and Security Division
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ConfigMgr 2012 R2