Hello, and sorry you're having problems. The Roku letters roll around the screen when the remote has become "un-paired" from the device, or when the box needs to be reset.
I'm not sure if you have a Roku "Stick" inserted directly into the TV, or a Roku "Box" that connects using a Cable. Can you tell me that please?
If you have a Roku "Box" then perform these steps:
1) Shut the TV off.
2) Unplug the power cord from the Roku for 10 seconds and plug it back in.
3) Locate the tiny "Reset" button on the upper right REAR of the Roku, and press and hold that with the tip of a pen for 8 full seconds and release.
4) Turn the TV on and then the green light on the Roku remote should start to blink. If it does NOT blink, then REPLACE the remote batteries with fresh ones and start over from step 1.
If you need further assistance let me know. Before you go, PLEASE DO click at least a 3 STAR RATING, at the top of your screen. That is how I am credited for my efforts by the site. You can follow up any time as needed at no additional cost.
I can be more specific if you can tell me which of the 5 model Rokus you have?
I'm not available by phone. There's the Roku 1, Roku 2, Roku 3, Roku LS or Roku stick. Any ideas which one you have?
Can you postback with a photo of it?
Do you need further assistance with this?
Another expert here to try to assist. I was hoping to make an appointment with you to talk over the phone. I am on est zone and will be happy to call when you're are available.