Sometimes it's needed to stop or start a ConfigMgr component because of malfunction. Within ConfigMgr 2007 this can be done in the ConfigMgr console. Just navigate to System Center Configuration Manager / Site Database / Tools / ConfigMgr Service Manager. Rightclick ConfigMgr Service Manager, point to All Tasks, and then click Start ConfigMgr Service Manager.
Within ConfigMgr 2012 it may be harder to find. Service Manager can be found here in Monitoring / Overview / System Status / Component Status and mark Component Status. Go to Home (found in the ribbon) and click Start Configuration Manager Service Manager.
That way it's possible to stop or start a ConfigMgr component.
Hope it helps!