I have a weird issue with my Roku. It used to work flawlessly, but I had an issue with my computer so I have to restart my modem. After that, Roku can no longer detect it.All devices in the house can detect the modem and connect immediately with no problem.The TV is directly connected using Ethernet.Roku does not detect any wireless or physical connection. I've restarted Roku, Modem and TV already. TV works perfectly as long as I don't use Roku.
Does you Express see any wireless networks? Most of the Express models (and there's been a lot of them) only work on 2.4GHz channels 1 to 11.