Solution: Check whether the service "ApacheApplicationsManager" is present under the services menu and also whether its Startup Type is not Manual. If not then navigate to the <AppManger-home>/bin folder in command prompt.
1. Execute the uninstallService.bat
2. Execute the installService.bat
Check whether two services ApacheApplicationsManager and ManageEngineApplicationsManager are present in the services menu and then start the ManageEngine Applications Manager in the services menu.
Note: This answer is applicable only for Applications Manager version 7.x. From version 8.0 onwards, we do not bundle Apache service with Applications Manager.