Sometimes it can be quirky.

So some restarts. Make sure TCP/IP is set to your WAVELAN card, and that you are connecting via DCHP.

Set AppleTalk to infrared just to mitigate any interference with your ethernet connection.

Restart several times.

If it just won't work, download the Orinoco 7.2 wifi driver from versiontracker.com

Install it, and try it.

Let us know.