Can't connect to internet through Airport Express anymore

Suddenly, my PowerBook can't connect to the internet through Airport Express. Monday late afternoon--everything was fine. Put it in sleep, come back a few hours later, can't connect.
Thing is, Airport/wireless is working. Can stream audio to my home stereo.
And the DSL/modem are working. If I connect the machine via ethernet directly, I'm online.
Saw that some other users began having problems with USB/printer connections Monday. Could my problem be related?
What gives?
Any ideas?

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.
o Go to the Internet tab.
o Note the value for IP address. (Note: Do not list it here on the forum, just note what it is.)
o Is the IP address what you would expect from your ISP or is it something like: 196.254.x.x?
If the latter, try the following ...
Modem/Router Power Recycling - Quick
o Power-off the DSL/Cable modem, AX, & computer(s); Wait at least 5 minutes.
o Power-on the DSL/Cable modem; Wait at least 5 minutes.
o Power-on the AX; Wait at least 5 minutes.
o Power-on the computer(s)
If this fails to get the modem to "recognize" the Internet router, then try the "Full" version.
Modem/Router Power ReCycling - Full
o Power-off the DSL/Cable modem, AX, & computer(s). (Wait at least 30 minutes. If possible, leave the modem off overnight.)
o Power-on the DSL/Cable modem; Wait at least 15 minutes.
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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I am trying to connect my new imac (2.4Ghz,OS X 10.5) to the internet through my Airport Express (v6.3) but have encountered some problems.
The set up goes like this:
Cable Internet <wired> TP-LINK Router <wired> AE <wireless> imac
The internet is coming from my landlord on the bottom floor of my apartment so I can't change the router.
The router is assigning a static IP to my AE (192.168.5.101).
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Regards
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Hello Starwolfgang. Welcome to the Apple Discussions!
The router is assigning a static IP to my AE (192.168.5.101).
Are you sure that this provided IP address is static? If so, you also need to note the provided DNS server(s) IPs as well.
On the imac I set the Network preferences to manually select an IP address (192.168.5.110) which is out of the range of the Router (192.168.5.101-108).
Since you configured your AX in bridge mode, your computer will be dependent on the NAT (& possibly DHCP) services provided by your apartment's router. Assuming that your landlord doesn't filter out any IP addresses and that the IP address you set is valid, you need to compare your iMac AirPort's DNS server address settings with that provided by your apartment's router to be sure they match.
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It has something to do with the connection from the base station to my computer
I don't think so..
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EDIT
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Can't connect to internet through Airport Express anymore

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