Wireless connection problems - Airport extreme card

Hi, I've just fitted an Airport extreme card to my PB 15" Aluminium and, in order to connect to the net via my third party wireless modem / router. The modem is provided by my ISP - T-Net, (Germany) and is a Speedport W501V and am having major dramas trying to connect wirelessly! I can connect via the built in ethernet port. but for can't with the airport card. The instructions for the modem are all in german, which is fair enough since I've just moved here, but isn't helping me try to sort out the connectivity problems 'cos I dont speak the language. I suspect that there are password issues or that the network settings are incorrect, the modem is definately 802.11 b/g compliant and i've been given a password that is 8 figures long - not the 5, 13, 10 or 26 figures that the apple support articles state for ASCII / HEX passwords respectively. After 3 days of trying I'm going mad! has anyone got any solutions / suggestions please.
PB 15" Aluminium / Airport Extreme Card Mac OS X (10.4.6) Third party modem - Speedport W501V, ISP Provider - T-Net germany

It sounds like a WEP issue.
One of the problems with WEP is that the actual standard relies on a 10 character HEX key for 40bit WEP and a 26 character HEX key for 128bit WEP.
In order to make things easier for people, vendors use certain algorithms to convert simple alphanumeric passwords (or passphrases) into HEX keys, thus enabling people to use simple memorable WEP password rather than lengthy HEX keys.
The problem is that different vendors use different algorithms to generate the HEX key and therefore a ASCII password on an AEBS will be hashed differently on a Netgear client and vice versa.
One thing is a 13 character 128 bit WEP password will be hashed by all vendors in the same way (if you use 40bit WEP then a 5 character password is required).
Though sometimes not even that works and the HEX key must be used regardless.
AirPort: Joining an encrypted wireless network
http://docs.info.apple.com/article.html?artnum=106424
Choosing a password for networks that use Wired Equivalent Privacy (WEP)
http://docs.info.apple.com/article.html?artnum=108058
iFelix

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hello forumites,
firstly, if this post is similar to one that has already been well-read and widely responded to, i apologize and ask that you respond with the link to said thread.
my issue pertains to an iBook G4 (circa 2004 i believe) running OS X 10.4.11 with an apple-installed AirPort Extreme card (firmware version 405.1). i have never had any problems with the card previously, but in the last week it has quite suddenly ceased to connect to any wireless network i attempt to log on to (both password protected and non). despite the card's sudden inability to connect, it still is able to recognize all the wireless networks in my location (i know this as the networks are still listed in the AirPort status pull-down menu).
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restarted the card (turned it off and on)
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used the network diagnostics program
used the network setup assistant program
attempted to connect through the system preferences (network)
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did a complete erase and install
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firstly, tesserax, a tremendous thank you for your help. unfortunately, i tried each step you suggested, but the problem continues.
step 1: i have tried and failed to connect to several different networks in a handful of locations (home, work, friend's house, local coffee shop, etc.).
step 2: i have disabled my own wireless encryption as well as the wireless encryption at a friends house, however, to do so i had to use their ibook, as my own either didn't list the base station in the AirPort utility (although it did list the base station in the AirPort status pull down), or it asked for a password even though the base station wasn't password protected (maybe this may add some insight into the issue?).
step 3: i have connected the computer directly to the modem using an ethernet cable and was able to go online - perhaps this means the problem is related solely to the card.
step 4: i moved the the com.apple.networkConfig.plist file and and the SystemConfiguration folder to the desktop and restarted. unfortunately, OS did NOT rebuild the files. instead, i had to go through the network diagnostics to rebuild them manually. while the files were replaced, the problem was not solved.
step 5: i reset the PRAM, but the problem still exists.
step 6: i reset the PMU, but the problem still exists.
i then tried various combinations of your suggestions, including moving the files out of the preferences folder and then reseting the PRAM and the PMU, but still nothing.
after having attempted every fix i could think of (and that was before posting to this forum) i did a full erase and install of the OS. since that's usually the cure all to whatever ails the computer, it's my assumption that the issue is a physical (hardware) one. that said, if you have any other suggestions i will be more than happy to give them a shot.
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Wireless connection problems - Airport extreme card

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