"See administrator" error with Mac mini airport card

Help, please. My Mac mini has an airport card installed. I got a new cable modem with a wireless N router (combo cable modem plus wireless N router) and I went to wirelessly connect my Mac mini's airport card to it.
I guess I typed the wireless router's password in wrong too many times or something, because suddenly I received the following airport error message on my Mac when trying to join the network (during the "The network so-and-so requires a WPA password" phase):
"See administrator."
It will not let me connect to my wireless network, even though my Macbook, my iPad, and my Roku player are connected to this wireless router/combination cable modem just fine. The Mac mini is connected to it through Ethernet.
Also, with my previous set-up, a wireless router (a Belkin N router) combined with a cable modem from my ISP, the Mac mini was connected at the same time both wired (Ethernet) and wirelessly (airport).
So I cannot figure out what is wrong and I cannot figure out how to clear this message.
I have already tried a solution that I found here which is indirectly related:
http://hints.macworld.com/article.php?story=20060318124936642
because yesterday I was also getting a System keychain error but I can't seem to reproduce that at the moment. I must have cleared that one, but I still can't access my wireless network through the Mac mini.
I am locked out of my wireless network on my Mac mini even though I have full administrative rights on my Mac mini.
Can anyone help me figure out this conundrum? Thank you.

I did find some keychain system files in Library/Keychain.
But in trying to access items in my Keychain Access, I get a message from Keychain Access stating, "Keychain Access wants to use your confidential information stored in "(name of wireless network)" in your keychain. To allow this, entre the "login" keychain password."
I then enter every password known to mankind and it doesn't accept any of them. This is me trying to access an Airport password that is stored in the "login" area in my Keychain Access. I do not know what the mysterious "login" Keychain password is.
Anyway, to go back to the main issue, I am locked out of my wireless network and get the mysterious "see administrator" error. That is the main error message to focus on. Thank you.

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Hi,
My MacMini is disconnecting very frequently from my home network. Using my MBPI I cam access the internet. So I know the problem is not with the internet service provider or wireless router. I re-started the MacMini and try accessing my home network and get asked by my wifi network password. However it times out and boots me out. Ocassionally, when I manage to connect to the internet I check for Mac software updates but again it times out. Ii seems that the problem is with the Mac Mini Airport. Any ideas?

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I've talked to Apple Technical Support re which computer is best for me.
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I've detailed below my existing set-up, my existing configuration, my desired set-up (as recommended by Apple expert) and questions I have.
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Hardware...
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2. PowerMac G4 (PowerPC processor) computer
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3. _______________________________________
4. _______________________________________
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6. _______________________________________
7. _______________________________________
8. _______________________________________
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When I play keyboards or use my keyboard as a midi controller it connects to my computer via the MOTU micro lite (midi-usb interface).
I don't currently have a keyboard. I used to use my basic Yamaha PSR-540 keyboard as a midi controller but as it's not weighted and faulty I needed to get a new one. We got a new one via Thomann which was the M-Audio Pro Keys 88 keyboard but this quickly became faulty. We returned it and have since been considering other weighted keyboards. I am simply wanting a keyboard with Aftertouch, either 76 or 88 keys, weighted keys and very importantly, hammer action where the action is fast. I don't care for other controllers on the keyboard, on-board sounds, iPad compatibility or whatever.
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Q1) Can you recommend any keyboards meeting my specifications?
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Q3) Do I need to have the MOTU micro lite (midi to usb) unit? Don't most keyboards these days connect direct usb to usb on the computer?
Q4) I'm happy and used to the sound out from my Quested monitors. I'm happy and used to the sound in using my ADK microphone. What do I need for these to work best with the Mac Mini? Is my MOTU 2408 good for this, or is another MOTU product needed, or another product altogether?
Q5) Depending on (Q4) do I need a soundcard installed in the Mac Mini as I read on a forum that these days the audio interface acts like the soundcard?
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发自我的 iPhone
在 2014年11月7日，下午4:32，Apple Support Communities Updates <[email protected]> 写道：
Apple Support Communities
selenafromshenzhen has posted in the Using iPad community.
IPad Mini Won't Sync With Mac Mini (ios 8.1 OSX 10.6.8)
You're supposed to download the latest iTunes from Apple official site and install it on your Mac.
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"See administrator" error with Mac mini airport card

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