I was having trouble getting my Dell Audio Receiver to hook up after installing a wireless router, even though I was still using an Ethernet connection on the router.
After searching on this site, I found Roger's solution of plugging in an Ethernet hub between the router and the receiver. It worked instantly. I was then able to remove the hub and reconnect directly between the router and the receiver. My understanding is that this will have to done every time the receiver is unplugged. I don't understand why this works, but it does! Much thanks to Roger

Check "ARM stops working after router install. Help!" posted on 4/7/2004 if you want to see where I found the solution.