"JMM" hath wroth:
Can you "see" the router at: http://192.168.1.1 via wireless? If not, your WEP encryption is probably not the same. There are two different ways for the brilliant and creative authors of wireless drivers to convert from ASCII to Hex WEP keys. To make matters worse, Windoze XP doesn't offer much in the way of diagnostics. If you're using WEP, use the Hex key, not the ASCII key and it should work.
If you can "see" the router, check the status page and see if you're really connected.
If you've been tinkering with settings or juggling hardware, power EVERYTHING off. Turn on the cable or DSL modem first. Wait about a minute. Then, turn on the WRT54G. Wait about 2 minutes. Then, turn on the wireless computer. You don't always have to do it this way, but it's the only way to guarantee that you won't end up with a
169.254.xxx.xxx IP address.If your WRT54G happens to be a version 5 model (serial number starts with CDFBxxxxx), you have my sympathies. I suggest a firmware update which might help with some bugs. The other versions of the WRT54G are fine.