You could see something for sure.
Verify the input you have the Roku plugged into is the one you currently have selected on the TV.
If that doesn't work, plug use a paperclip to press the small "reset" button button the Roku.
You can also choose to perform a hard reset:
If a soft reset doesn't fix your problem, a hard reset may be your only option. This will clear all data off the Roku 2 and reset it to factory default settings.
1. Remove all cables except the Power cord.
2. Using a paper clip, press and hold the Reset button on the back of the device for about 15 seconds.
3. Continue to hold the Reset button, then remove the Power cord from the back of the unit.
4. Release the Reset button, then plug all of the cords back into the device.
The Roku 2 should walk you through the setup process again.
You can also accomplish a hard reset by selecting Settings > Factory reset > Factory reset > Yes on the device's menu.
Finally, try using a different HDMI cable.
Let me know if any of this helps.
How to Hard and Soft Reset the Roku 2