You need all the files I mentioned in previous posting if your database is in no archive mode and shutdown properly.

You need archivelog files also, if your database is in archivelog mode,as your database checks for SCN sync when you open the dataabse. If your logs are not in sync you can't open the database in archivelog mode.

In such situations, you open the database resetting the logs and start archiving freshly which gives a begining SCN.