It is likely to happen that if you have created new services to start your DB , these new services will only make an instance and not open your database so it is very ordinary to make a script as CMD file ( like the incoming ) and put it on the NT desktop and just click at it to start the database :

** Assuming that the SID is PROD

net start oracleserviceprod
set Oracle_sid=prod
svrmgr30 @c:\start.sql


start.sql => is a text file contains :

connect internal/manager;
startup open;