No Airport connection with Mac Pro

I cannot get access to my (password protected) WLAN modem with my Mac Pro. I have to go via Ethernet through my Powerbook. It only works when I set the modem to require no password for Internet access, once WPA is enabled, the Mac Pro Airport connection fails even though it "sees" the network alright.
What am I to do? Any settings in the DSL modem properties perhaps?
Most grateful for answers!

That sounds like progress!
WEP / WPA and WPA2 all use a numerical (hexadecimal) key.
You give the software a readable phrase - and it turns the phrase into the number. But sometimes the same phrase becomes a different number.
Try this. Turn on WPA.
On your wireless-connected-Powerbook. Go to the network list. Click edit - and click show password.
You'll see the HEX version of the passphrase. $afbc0232...
Try THAT number on the Mac Pro.

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