pprms

Hi: I am a total newbie with Linux. Have installed Mandrake 9.1 on a Dell Dimension 82K laptop - and, best of all, I have a Fast Ethernet connection in the plug at the wall in my house (by way of fibre-optic cable!). 10 mbit symmetrical. BUT, I just can't seem to get connected to the Internet ;( I have tried the wizard in Mandrake Control-centre. It finds my 10/100 network card (says "up"). Can anyone help, please? Best, pprms