Can't connect to internet through Airport network

Previously - worked
Internet: DSL
Network: via Airport Extreme
Computers: 3 (G4 Tower, PowerBook G4, Xbox360)
Setup: I ran the ethernet cable out of the modem into the Aiport Extreme. Then I ran another ethernet cable into a router which then split the signal into two lines -- one going to the tower and one going to the Xbox. The laptop connected wirelessly. This worked using DHCP assigning multiple IP addresses to all on the network and indeed the two computers surfed the net with ease and I had no problems connecting or staying on Xbox Live.
Currently - doesn't work
Internet: Cable (Charter)
Network: same
Computers: same
Problem: I recently switched from DSL to Cable internet for faster speed. Here is what i found: When i connect the ethernet cable directly into the tower from the modem i can access the internet. If i connect the ethernet cable directly into the PowerBook G4 i get nothing. If i try to connect the ethernet cable to the Airport from the modem i get nothing as well. At first all i thought i had to do was change the account settings from that of the DSL to that of the Cable internet -- only there are no account settings for the Cable internet. I literally just plugged in the cable and was ready to go. I have tried resetting my airport to get rid of my previous [DSL] settings and redoing the Airport Setup Assistant to no avail.
G4 Tower, PowerBook G4 Mac OS X (10.3.9)

ok so i unplugged my modem for a few minutes and then plugged the ethernet into the airport and turned the modem back on. now i can get internet on both my laptop and my tower. that works, thanks!
an odd aside tho is that before, when i was connecting through PPPoE, the laptop would automatically connect to my network (regardless of how many networks the airport card was picking up). now that i have the airport set to just connect via ethernet i have to manually log onto my network every time. is there a setting i'm forgetting about that enables automatic log in or is this just the case with connecting via ethernet?
here is the next problem, though. i bought a wireless adapter for my 360 and it cannot detect my network. it detects two other different networks that are in my complex but not mine. i have no idea if this is an airport issue or a 360 issue as powerbooks just automatically detect an airport base station. i have tried testing it in the same room as the airport with no luck. the only way i have connected to Xbox Live so far was to hard line an ethernet cable to the 360, shut the modem off, turn it back on and connect that way. if anyone knows anything about the 360 or has had similar problems trying to get their 360 up and running wirelessly through an airport please let me know
Mac OS X (10.3.9)
Mac OS X (10.3.9)

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Hello mnkyby. Welcome to the Apple Discussions!
It sounds like your AirPort Express Base Station (AX) in not getting a proper IP address from your modem.
Try this ...
o Connect to the AX's wireless network, and then, run the AirPort Admin Utility.
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o Is the IP address what you would expect from your ISP or is it something like: 196.254.x.x?
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o Power-on the AX; Wait at least 5 minutes.
o Power-on the computer(s)
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Robin Berman wrote:
I still can't connect wirelessly via airport extreme.
Using a Powerbook running 10.6.4
That's not possible. Do you mean "MacBook"?
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http://discussions.apple.com/thread.jspa?messageID=10695921&start=1
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~~~~~~~~~~~~~~~
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I have a PPPOE ISP account. Before upgrade to Lepoard, just fine. Now I can only connect to internet using cable via my router moderm. I cannot connect my wireless router.
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I don't think so..
I just posted a reply which totally vanished.. strange strange website now.
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EDIT
Sorry this is half double post.. the previous page refused to display.. now it has returned..

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System Preferences/Internet & Network/Network
Unlock the padlock
Locations: Automatic
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Click the Assist Me button
In the pop up window click the Diagnostic button.
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Mac OS: How to release and renew a DHCP lease
*No internet connection (wireless)*
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10/28/11 9:04:32.000 PM kernel: en1: BSSID changed to 00:14:6c:94:93:72
Does this mean anything to anyone? Thanks in advance for any help you can offer.

I am having the exact same problem. It started with 10.7, was fixed with 10.7.1, then came back again with 10.7.2.

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Also, check that the antenna cable is firmly attached per this Apple Article: http://docs.info.apple.com/article.html?artnum=108039
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Here's 10.4 directions, not to different from 10.5, see if it helps...
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Launch your keychain access in Utilities and delete your access point keychain entry.
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