Unable to connect to the internet

I have a used PowerBook G3, and I am not able to access the internet. It is hardwired to my Modem, and I have followed the Internet Setup Assistant supplied with the PowerBook instructions, POP, SMTP, etc. for e-mail, and DNS information also. No go. I have literally tried everything that I can think of to resolve the issue. The PowerBook is in excellent condition for being used, although I will need to purchase a new battery pack when I finish finding the solution for internet access. IDEAS?