Download and install Mac OS X 10.3.3 Update or later to avoid this issue.
If you're not ready to install, these tips can help:
If you forget to insert the card before you turn on the computer, Mac OS X 10.3 probably won't recognize it. If this happens, or if you eject it after starting up, just restart your PowerBook.
Important: Information about products not manufactured by Apple is provided for information purposes only, and does not constitute Apple's recommendation or endorsement. Please contact the vendor for additional information.