After installing Mac OS X 10.3.1 Update or later, you won't be able to use the Mac OS X Panther Install disc--part of the Mac OS X Up-To-Date program--to completely reinstall the operating system.If you have Mac OS X 10.3 Panther retail CDs, DVD, or Restore discs, you can simply reinstall Mac OS X. You don't need to follow the steps in this document.Note: This document applies to Mac OS X 10.3 through 10.3.9.