Oracle - ERROR - ORA-01033: ORACLE

Hola, si alquien sabe porque se puede estar produciendo este error cuando trato de iniciar Oracle,

si al conectarme ingreso

usuario: SYSTEM
contraseña: la que ingrese durante la instalacion
conectado host: orcl

Gracias.

ORA–01033 Oracle startup or shutdown in progress
Cause
An attempt was made to log on while Oracle is being started up or shut down.
Action
Wait a few minutes. Then retry the operation.