Thanks for posting here in the Roku Community, @lisajo51!
We're sorry to hear that you're encountering an issue with your TV Screen, which happens to have no color after power failure. We'd like to be able to assist.
Here's a quick fix that you might try:
- Press Home
on your Roku remote
- Scroll and select Settings
- Select System
- Select Power. If you do not see a Power submenu, skip to the next step.
- Select System restart
If this still doesn't resolve the issue, let us know and we'll assist you further.
The Roku Community Team
Emmanuel-D.
Roku Community Moderator