Service Unavailable – Http Error 503.The service is unavailable.

Please follow a general practise when your SharePoint Central Admin does not work make sure

1)    Go to run->Services.msc à SharePoint timer services are running()

2)    Go to run->Services.msc à SQL(SharePoint)  service is running

3)    Go to IIS àIn application pool – make sure Central Admin  v4 application is started

In my case the application pool wasn’t working, so I started the Central Admin v4 application pool

And TaDa ! My central admin starts working J