I tried it as well, didn't work. The wireless light on the modem wouldn't come back on. The tech support guy reset our network, had me create a new SSID and all this crap, and finally the wireless light popped back on. I wish I could explain how we fixed it, but I was extremely hungover and groggy that morning.
As for the Roku, I can't explain that either. Apparently some others have had the same issue and the consensus seems to be, if it isn't under warranty anymore, you hasve to buy a new one. Oh well, we still have the Wii to stream movies from for now. I miss my Pandora radio channels, though.