How to Connect iMac to Wi-Fi?

Go back to the original settings?

What works with the changed settings?

You going to have to buy a wifi usb adapter that supports your new setting.

1. Ethernet Bridge
   

Please note this requires mac os x 10.5 or greater to configure or windows xp to configure.
Ethernet Bridge "The versatile Wireless-G Ethernet Bridge can make any wired Ethernet-equipped device a part of your wireless network." from linksys example: http://www.amazon.com/Linksys-RE1000-Wireless-N-Range-Extender/dp/B005FDXMJS/ref =sr_1_1?ie=UTF8&qid=1314563758&sr=8-1
Once configured, you can use it on any ethernet port.

2. Airport ExpressAirport Express is an external unit and you can configure it as a bridge. 802.11n ( I believe you will need a more modern version of Mac OS X to configure. Sadly, Apple uses a configuration program to configure, not a web browser. )
   https://www.apple.com/airportexpress/
3. USB dongle
   
1. BearExtender
   http://store.bearextender.com/products/bearextender-mini
2. Newer Technology MAXPower 802.11n/g/b USB Adapter. New Technology has made these adapters for a while this one is for OS X 10.5 and greater.
   http://eshop.macsales.com/item/Newer%20Technology/MXP3802NU2C/
3. Newer Technology MAXPower 802.11n/g/b USB Adapter. New Technology has made these adapters for a while. What Mac OS they supports changes over time. Be careful which one you get. Amazon claims to be selling older ones as of 2/16/2013. http://www.amazon.com/NewerTech-MAXPower-802-11n-Wireless-Extension/dp/B00132CMN C
4. Tenda W311M
   http://www.microcenter.com/product/373032/W311M_150Mbps_Wireless_N_USB_20_Adapte r
   Most of the real work is done in software. Took 15% to 25% of the processor in my iMac G3 600 :(




The letters n/g/b correspond to the speed of the data transfer. You should match the speed to your existing router. You best match on the highest speed. N is the highest. G is middle. b is lowest.