Hmmmm?! I have to disagree with the answers here. My reasoning is this: I have 10 800 MHz eMacs. The standard Airport card WILL NOT fit in them; I just tried it. The slot provided for card installation is slimmer than the Airport Card, and slightly "stepped" on the sides (like an Extreme card). As to why the card is not registering in your eMac: Firmware issue You should double check the devalias and see if the card is listed there. If it is...ouch! If it isn't: Time to do the old nvram reset, and set defaults. Remember, computers need to be reminded what they are, and what they are supposed to do, once they have been upgraded. That eMac may not know it has the wireless card, because it was never shipped with one, or been intended to have one. The price of buying school surplus.... <sigh> Give her a good old firmware "slap", and see what she does. Update: Further proof of my response: http://support.apple.com/kb/ht3024 eMac ATi and eMac (USb 2.0) both show Extreme supported NOT standard Airport.