Mac mini won't recognize airport base station

Hi,
I am posting a new thread because I can't find one that is similar to my case. I have a late 2010 Mac Mini. Here is what happened:
1. Using it this morning to wirelessly print a document. Recieved notice that printer appears off-line.
2. Re-booted printer, re-started airport base (snow white) , no luck.
3. Did above again and restarted Mini... no luck
4. Airport signal indicator suddenly went gray on the bar and notice asking me to join an unrecognized netwok.
5. restarted Mini... would not recognize my network and Airport Base station
6. restarted mini and ABS.. still the same gray bars but being prompted to join someone else's network
7. did no.6, 3-more times... no change
8. Opened airport utility... does not appear in the scan
9. opened network preferences and clicked remember network... restarted... same SIGH!
10. checked system profiler... airport card is on but is "not associated". (Could it be broken but on?)
11. did no.6 again and also restarted DSL modem... same thing
12. Turned on my Macbook ABS recognized and was able to print my document through it no problem.
Until an hour after I turned on my Mini, it was fine.
All other devices 2 macbooks, 2 windows PCs, iPod Touches and wireless printers work.
my first instinct was to do a permissions repair but it was taking to long to finish and had to leave... will this help?
ABS and Mac-mini all have latest updates. frustrated ,have to go to work... PLS HELP.
thanks

I'm sure if this is related but I'm also having a problem connecting a pre-2009 mac mini to an Airport base station. I have two others and they are working fine but one will not connect.
I can see the airport station and get a prompt for my password. When I try it, it times out and cannot connect. Another strange thing is the signal is only showing 2 out of 4 bars. The base station is less than 15 feet away and other devices like my iPhone show a very strong signal. The older mini is only 802.11g so I have left the multicast rate on the base station at 2.2 which I believe is the default.
I had been using an 802.11n USB adaptor but I wanted to go back to the internal wifi because the USB adaptor would disconnect whenever the computer went to sleep. I have the mini connected as a media center on a tv so having to always log again was getting frustrating.
I may try a clean install again, but the machine was just formatted and updated with a clean 10.6 about 2 months ago. I didn't install much beyond eyeTV and a few FrontRow plugins. Any ideas on how to debug wifi problems?

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