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Cut the airport off and back on again. After that, delete any wifi profiles you have, and then re-add them. This will clear any corrupt profiles and troubleshoot that. If you can't connect to anything after that, check that the airport card is connected securely. If, after all that, it still isn't working, and other devices are able to connect to the same network, then your airport card is probably no longer working.
You may need to open it up again and remove first the airport card and turn it back on and if that boot your computer there's a possibility that your airport is causing the problem and the airport may be loose and touching some other parts on it.
This is often a problem with Airport cards becoming defective over time. You mention that you have tried with an ethernet connection as well. When trying, make sure you disable your wireless connection. In addition, make sure that you are not using a static IP address or, if one is required, that you try assigning a different IP outside of your DHCP scope as you can be experiencing IP address conflicts.
What I would suggest is reseating the airport card as it may be the card has come loose or the cable is not connected properly. The following support page on the apple website will tell you how to do it.
The easiest way if your Powerbook doesn't come equipped with an
Airport card or isn't capable of supporting an Airport card is to purchase this http://www.sonnettech.com/product/aria_extreme.html it slides into the PCMIA slot on your Powerbook G3 (the credit card sized slot on the side of your Powerbook G3). There's support issues and model variations on older Powerbook G3's regarding Airport Card support and they're not as readily available as a standard PCMIA wireless card. This is my best suggestion for your situation.
In the upper left corner of screen click blue apple -> location -> automatic , also you can look at Applications->Internet Connect.
Side note - if you are using other people's wireless without their express consent, this is now on the law books as illegal and they are beginning to prosecute more and more people for this very thing, it is simple enough for them to catch you as well. It would be much less expensive in the long run to purchase legal internet services.