Airport Express is Not Recognized ?

Method-1

Fix Airport Express is Not Recognized

I found the same problem which my airport express status light is green but Airport Utility can not see it. Also I cannot print or stream any music.

However I followed Bob's instruction to turn off and on again. I works but then the same problem comes back again.

So I downloaded and installed the Airport utility 5.6 for OS X Lion. This works. Unlike Airport Utility v6.0 the version 5.6 can see the airport express (which cannot be seen by v.6).

However I still cannot print and stream music via my Mac Book Pro or my iPhone. Please let me know how to fix the airport express problem.

Method-2

Fix Airport Express is Not Recognized

Run the firmware update today and Express stopped working.

Finally found that settings on my Airport Extreme had been reset on the wireless tab where you check "Allow Network to be Extended".