ORA-01033 "ORACLE initialization or shutdown in progress" caused by ORA-10567 "REDO is inconsistent with data block"
Since the problem is in your undo tablespace. You can drop it and create a new one. Steps in this article:

http://www.my-whiteboard.com/how-to-drop-and-recreate-oracle-undo-tablespace-and-its-data-files/