Just another day I received following error while starting my agent. As soon as I received following error I felt like Deja Vu. I had similar feeling few days ago. I quickly looked at my blog post history and I found out following article SQL SERVER – Fix : Error : The request failed or the service did not respond in timely fashion. Consult the event log or other applicable error logs for details.
TITLE: Microsoft SQL Server Management Studio
Unable to start service SQLSERVERAGENT on server PINALKUMAR. (mscorlib)
Service Logon Failure (ObjectExplorer)
Indeed this was again issue with my changed password which I forget to change it for my SQL Server Agent. Once I changed the password, it fixed itself.
I guess this should be last time when I change my password and do not change it in my services depending on the same login.
Reference : Pinal Dave (http://blog.SQLAuthority.com)