I have an Airport Express (AE) connected to my stereo system, which is it's only use. It has previously been set up to receive wifi signal from my main wifi router, so no wires. Everything has worked great. Now I want to run it wired instead, but after suspending wifi on my main router, and attaching an Ethernet cable to the AE, the AE doesn't connect to the network anymore. It blinks yellow, and the Airport Utility on my Mac can't find it either when I scan for it. I haven't reset the AE because I'm afraid I'll lose my previous wifi piggybacking setup, which I unfortunately don't remember anymore how I did. Any ideas?