The link above indicates that there are A LOT of other folks with EXACTLY the same issue. Looks as if this issue has a similar "Failure" timeline... Perhaps ALL these posts need to be LINKED together to get a response from ROKU!
Below is a copy of my post on the other forum location listed above:
I have the EXACT same issue, and as I utilize (2) ROKU units, and the other one is functioning perfectly well off the exact same WIRELESS....
This unit will not recognize ANY wireless signal exists, select wireless for "SETUP" = blank field where the connections available should be shown. I have owned this unit less than a year...what gives???? (By the way, I have probably "sold" at least (10) additional ROKU to friends and family via "glowing" testimonials....I'm not a very satisfied customer at this moment... What support does ROKU provide for this issue???