airport express - an error occurred joining the selected wireless network
I am attempting to setup a new Airport Express wireless router and I am recieving this error message
an error occurred joining the selected wireless network
This is the same issue that occurred with my old Airport Express (I got a new one today to attempt to remedy the situation). The old AE worked in the Apple Store and connected to my Mac Book Pro (10.6.8) just fine in the store. On the second visit to the store a new Express was suggested and I got home this afternoon, plugged in the new AE, and the same problem exists. The connection with Comcast works fine when I run my ethernet cable connection directly to the laptop. At this point it seems that there is interference on the frequency from some other device, but I am not running anything (e.g. wireless phone) that can be blamed. It may be another unit in my building nearby that has a device that is interferring with the connection, but obviously this cannot be verified. Suggestions?
MacBook Pro, Mac OS X (10.6.8)