Airport Extreme Connected to Internet, Yet No Longer to Powerbook G4

Airport was connected over a cable modem to the internet just fine until last night.
It stopped working--no browser or email.
I can still connect fine directly from the cable modem though.
Internet Connect seems to think I have a strong connection, but my applications (browser, emails) disagree.
I've been accross the internet and back trying to solve this.
I've tried:
a) Apple>System Preferences>Network shows:
"Airport is connected to the network <<my network name>>. You are connected to the internet via AirPort"
b) Apple>System Preferences>Assist me>Assistant
(or Applications>Utilities>Airport Setup Assistant) shows:
"Congratulations! Your Airport Extreme is configured to connect to the Internet and share a USB printer. If you use a cable modem to connect to the Internet, you may need to turn the modem off, wait a few seconds, and then turn it back on."
Internet Connect then, still, shows a strong signal level and status reads: "Connected to <<my network name>>. Connected to the internet via Ethernet."
c) Apple>System Preferences>Assist me>Diagnostics:
Airport works
Airport Settings = failed
It then wants me to reboot the device (i.e., I think, the modem or whatever else isn't sending a singnal to the computer).
I tried this but again, the modem works fine .... it seems to be somewhere between the PowerBook and Airport Extreme that is the problem.
d) I've tried with no success downgrading from Airport Extreme Firmware V5.6 to V5.5.1
e) With no success I've reinstalled from CD the Airport Extreme software V4.2
f) With no success I've selected "Enable interference robustness" thinking perhaps another network in the building was interfering (airport seems to recognize another airport but iStumbler doesn't seem to).
g) I've messed with Apple>System Preferences>Network>Configure so much now that if there was anything that isn't broken, it probably is now.
I've taken a crash course in AirPort over the last 24 hours (and failed) and have soft (5 seconds) and hard booted (30 seconds?) this thing so many time .... I'm ready to, you know, boot it out the door next (it has a nice aerodynamic shape I've come to really appreciate in the last several hours).
I know there is something I'm doing wrong, overlooked, or haven't tried.
Any thoughts????
Thanks in advance,
Jayson
PowerBook G4 17" Mac OS X (10.4.3)

Jayson,
It sounds like your airport needs to be changed to no longer distribute IP addresses the way it is currently set to do. Go to the airport setup, make note of settings as you go (shift + command + 4, select area with "crosshair" cursor and let go to make a pdf of the screen, selected area, print the pdf in PREVIEW if you want to save yourself the time writing them down!), and MAKE SURE YOU ONLY CHANGE WHAT YOU UNDERSTAND and are sure of. Sorry for yellin'!
In the airport settings (sorry, I'm retrieving from my organic grey/white matter memory here), I believe there is a place in the internet tab for changing the APX to no longer distribute IP addresses, or to share single IP's, etc. If you wish, try to see if toggling off the distribution, rebooting (not resetting) devices, and starting up the computer allows a "tunnel" through the modem.
Many cable/DSL modems are firmware-set to ALSO distribute IP addresses, so the two devices (modem and airport) are constantly sending packets back-and-forth, handshaking endlessly and the most recently "shaken hand" is the device distributing addresses.
The problem arises here (or, at least this is one case I am describing in which your symptoms match up closely) since your computer sees the packets, the web traffic and "open door," etc., but it is somewhat like thinking a window is a door. You can see out of it, verify the "door" by looking outside, but the lock is on the OUTSIDE (the modem), locking you in, with your airport sitting idly and thinking that you can get out since it is essentially letting you have a distributed IP address...it's all rather like the mom from "Carrie" or something...you and your dirty pillows. Stay inside the closet for now-- yeah, right.
If shutting of distribution in your airport still allows the computer to connect as wired to the LAN port and your modem still plugged into the airport's WAN port (after saving airport settings and rebooting all devices, computer LAST, airport a few minutes after the modem), you are even more likely to be in this aformentioned battle of the handshaking devices.
If so, find out from manuals/manufacterer's online notes/good state-side non-Apple tech help (and other fictional situations) if the cable modem can be set to not act like a router, and more like a modem by just giving one DHCP address, or static address if you must, and not conflicting with a router. Don't say airport unless you must-- so many tech-help places quote the crapola cop-out that Apple isn't compatible or something. Most of the time, cable modems only require the fairly universal web packet compatibility, and the mac/airport does the rest. Very few modems, especially from a large broadband provider, will prevent you from using an airport or a mac. The few I have seen were firmware issues with older, rather ready-to-be-shot DSL modems that should have been doorstops or clay pigeon surrogates a long time ago.
If you can play around (with guidance) and reset the modem to simply get an IP, send it to the router (that is, the airport), and then let the airport do the distribution, all you have to do is switch the airport back to distributing a range of addresses-- I like the 10.0.1.x selection, but I find the last of three choices (something like 169.x.x.x) to occassionaly be the magic x-factor bullet from Narnia that makes the bells ring and your airport finally wired AND wireless.
Before you heed any "advice" I may be stating, do some googling regarding the topics I mentioned, since NOBODY is all-knowing or perfect in ANYTHING, and I don't want your problems to be worse. Exhaust all other sources of information that you may have, but the above prattling was from my troubleshooting an endless stream of constant problems with a similar setup, and it may help you. Reply if you wish and I'll add more if you want.
Sorry if I'm writing like a monkey *(&%% a football on an icy pond. I'm juggling a few upgrade jobs on my workbench, and listening to the new INXS album from itunes, so I'm a little geared up. BEST OF LUCK! Happy holidays, whatever they may be for you.
Likkimon

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Just this afternoon my internet connection slowed to a crawl. Pages would stall loading and I couldn't even collect emails. There was a connection there. A Google search might take a minute or so but anything else would barely flinch.
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Comcast is the ISP
I have an Extreme and an Express set up as a single wireless network.
Extreme is plugged in to the cable modem. Express is an extension of the Extreme.
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first time post here, looking for some help.
I have a small wireless network at home which runs as follows.
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The network works fine, signal is great all over the house however internet traffic is very very slow when devices are connected to just the extreme station (ie when out of range from the time capsule).
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Thanks for the reply. It seems to have helped a little - should I expect slower speeds from the extended network?

Airport Extreme Connected to Internet, Yet No Longer to Powerbook G4

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