Wireless stopped working for iMac only, any suggestions?

Hi Folks,
I have 10.4.11 installed on my daughter's iMac, and it had been running wirelessly over WPA Personal to a Buffalo router for three months or so. Yesterday it just stopped working. I can connect to other unsecured networks in the area (albeit slowly), and if i pick other secured networks in the area, it prompts me for a password for them.
My home network acts funny though. No matter what i select for the security of the network (WPA, WPA2, etc) it never indicates that i'm using the wrong protocol or have a bad password. For the other secured networks, if i punch in the wrong password, it pops up a dialog saying couldn't join. This one, no such luck..it shows full strength signal, gives an 'autoassigned' DHCP address and sits in isolation on it's own idea of a network.
If it wasn't for the fact that i can get onto other public networks, i would say it's bad hardware...but that works. I will probably try changing my SSID later this evening (kind of a pain b/c of other computers on the network) to see if there is something 'broken' about this SSID in it's configuration.
I've tried the dollar sign thing before the password. I've tried creating new "Locations", no joy. I've tried deleting this network from the 'preferred networks' list, editing it, creating new ones, etc...no joy.
Any suggesions?
Message was edited by: ReadHeaded

Hello RedHeaded:
Please click on the "Solved" button in the header of HenryG4's post, since that solved your problem.
Thanx

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