What would be a good place to look when a 7920 will not associate with any AP? I have the 7920 cfg'd with right SSID/ id/pswd and in call mangler and the router has the dhcp pools correctly cfg' d with option 150 cmd.
Are you getting a wlan link? Should see the radio signal show the bars if so. If not, then need to check ssid, authentication type, encryption. Sounds like you are using 802.1x or WPA-PSK since you said a password is being used. If using 802.1x, there is a submenu called EAP Mode, where default is Auto (will try EAP-FAST first), EAP-FAST or LEAP. For PSK, we support hexadecimal and ASCII.
But I would suggest you start with open authentication and no encryption.