I dusted off and fired up my 770 few days ago and ran into the similar problem. If I scan for networks repeatedly it will sometime detect the ssid, but always fails to connect and get a IP lease.

I only tried this under 2006, 2007 and 2008; and the last time it worked I was using a different wireless router. Search for "wifi" and "blind" on the forum for few others having the same problem. I'll have to try rolling all the way back to 2005 to see if that may work, but I suspect the radio in the unit is bad.

All I wanted to run it was as a remote for my Myth TV box I am setting up too....