@pbmarrow has it ever connected? Trying to see if this is something that just cropped up or an ongoing problem. Have you attempted to connect it via an Ethernet cable, just as a test? Want to ensure the networking in the box is working.
Assuming it has connected before, but now cannot, let's look at your router settings. The 4800 works on both WiFi bands, 2.4 and 5 GHz. However, it won't work on all channels in those bands. Of course, you shouldn't even see your WiFi if it's on an unusable channel, so that's likely not the issue. But on 5 GHz there are channel width settings that might cause an issue. Most routers offer channel widths of 20, 40 and 80 MHz. If yours is on 80 MHz, you might try reducing it to 40 or 20. It makes the connection slower, but no Roku can use the full potential speed of a 5 GHz connection anyway. On 2.4 GHz, there are also channel width selections, so if it's set higher than 20 MHz try dropping it down.
If you are using the same SSID for both radios (most do by default), you don't know which band you are trying to use. Many people (such as myself) use a different SSID name on 2.4 and 5 GHz, so we always know which one we're connected to. There are pros and cons to using either band.
Dan
Roku Community Streaming Expert
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