How to Solve SharePoint Service Unavailable HTTP error 503 Service Unavailable

SharePoint Error : SharePoint 2010 Central Administration HTTP Error 503: Service Unavailable

Administrative Tools - IIS Manager- Windows Server(ex:SERVERSP(DSS\ADMIN)) -Application Pools- SharePoint Central Administration--right click-- Advanced Settings--Process Model--Identity--Click(ex:DSS\ADMIN) --Application Pool Identity-- Current Account--Set--Enter details--Click OK Select SharePoint Central Administration right click and Start.