Self-assigned IP - No connection

I have a perfectly fine IP address when I'm hardwired, and a full signal, but no internet connection. Here's the steps I've taken. What am I missing?
-Obtained a valid IP address and connection by connecting my Powerbook G4 to my cable modem via ethernet.
-Turned off my computer, unplugged the cable modem, and let them sit, powered down, for over thirty minutes.
-Plugged the modem and Airport Base Station together via ethernet cord.
-Plugged the power into the cable modem. Waited for it to boot completely.
-Plugged the power into the base station. Waited for it to boot completely.
-Booted my laptop. AirPort: On. Full signal. No internet connection.
-System Preferences>Network>Network Status: "Airport is connected to the network home. AirPort has a self-assigned IP address and may not be able to connect to the internet."
-System Preferences>Network>AirPort> Configure IPv4: Using DHCP; IP Address: 169....
-Released and Renewed. Turn AirPort on and off. Released and Renewed again. Still 169 IP.
-Called ISP, said I was getting a good signal, problem must be on my end.
-Ran Network Set-up Utility. Get this error: Your computer could not connect to the Internet. Click OK to go back and change your network settings, and try again.
-Fails, fails, fails.
What is wrong? What am I doing wrong? And how can I make it right?
(All my software and firmware is up-to-date)
Powerbook G4 12 inch Mac OS X (10.4.5)
Powerbook G4 12 inch Mac OS X (10.4.5)

PrincessofMars,
I am getting the same issue. I just moved and got a cable modem from my internet company and went to set up my airport, old snow version, and I can't get both of my computers (pre-intel Mini and old ibook) to both work at the same time. I have been getting the "Self-Assigned IP - No connection" message as well. I have my mini working with the airport, but I can't get the laptop to work and I don't want to have to keep plugging in and unplugging stuff just to get the computer I am working on to connect to the internet.
Is it time possibly for me to just upgrade to a new Airport system?
- Sanjuany
I have a perfectly fine IP address when I'm
hardwired, and a full signal, but no internet
connection. Here's the steps I've taken. What am I
missing?
-Obtained a valid IP address and connection by
connecting my Powerbook G4 to my cable modem via
ethernet.
-Turned off my computer, unplugged the cable modem,
and let them sit, powered down, for over thirty
minutes.
-Plugged the modem and Airport Base Station together
via ethernet cord.
-Plugged the power into the cable modem. Waited for
it to boot completely.
-Plugged the power into the base station. Waited for
it to boot completely.
-Booted my laptop. AirPort: On. Full signal. No
internet connection.
-System Preferences>Network>Network Status: "Airport
is connected to the network home. AirPort has a
self-assigned IP address and may not be able to
connect to the internet."
-System Preferences>Network>AirPort> Configure IPv4:
Using DHCP; IP Address: 169....
-Released and Renewed. Turn AirPort on and off.
Released and Renewed again. Still 169 IP.
-Called ISP, said I was getting a good signal,
problem must be on my end.
-Ran Network Set-up Utility. Get this error: Your
computer could not connect to the Internet. Click OK
to go back and change your network settings, and try
again.
-Fails, fails, fails.
What is wrong? What am I doing wrong? And how can
I make it right?
(All my software and firmware is
up-to-date)
Powerbook G4
12 inch Mac OS X (10.4.5)
Powerbook G4 12 inch Mac OS X
(10.4.5)

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Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.
Back up all data on the internal drive(s) before you hand over your computer to anyone. There are ways to back up a computer that isn't fully functional—ask if you need guidance.
If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
Apple also recommends that you deauthorize a device in the iTunes Store before having it serviced.
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Click Apply.
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Hi there
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