Mac Mini & Roku:  Cant see WIFI

Enabled itunes sharing and sharing in firewall settings per Roku directions. Now my Mac Mini cannot see the Linksys-B wifi or for that matter, none of the other 14 wirless networks around me.
Did I flip the wrong switch? Pointers to correct-- how do I get it back online

Apologies for being vague. Here's all of the details I have:
1- Internet was running fine on a closed wifi network with WEP password
2- Got the roku and it couldnt see my closed network.
3- SHut down my linksys and comcast cable modem for 5 mins
4- restart it and now roku can see closed network but not itunes
5- Go to mac mini to enable sharing and probably clicked one too many screens. I clicked sharing in itunes but then went to network and on firewall (which wasnt on originally) I enabled sharing for itunes
6- then under sharing/services/xgrid I selected xgrid and went into Internet toos and selected a couple others and got strange message about if you share internet you may violate terms of ISP and be blocked or somesuch (i was almost through a bottle of cab by then)
7- Realizing my over zealousness I went back to restore it all back BUT
8- Now I cant see ANY wireless networks (used to see 9) while my other PCs see all
9- On network screen it says internet sharing is on even though on sharing screen it says it isnt
Regardless the mini doesnt see any wireless networks at all while other devices in home are running fine. This mini had worked flawlessly for almost 6 mos till now
ANY IDEAS? I promise to give back to forum
Kieran

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