Are you sure about your TV's model number? I don't find anything at all about a Samsung TV model LN-S4090D. I see similar numbers, but the differences could be important. Without any information about the specs of your TV, I'm going to ask some generic questions.
Have you tried a different HDMI port on your TV? Your post doesn't state that, so try that to rule out the TV HDMI port you used being bad.
Do other HDMI devices, particularly the newer ones, work on the same HDMI port on that TV?
Have you connected the Roku to a different TV to try and see if it's working?
Let us know about those troubleshooting steps and we'll see if we can come up with an answer.
Roku Community Streaming Expert
Note: I am not a Roku employee.
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