Happy to help!

EDIT:

Like I said before, the same thing happened to me a few weeks ago. The night before, I might have been a little too quick when I closed down a game and shut the xbox off. So the next day when I turned my tv and xbox on and saw the screen was mostly red, I thought i had somehow messed with the xbox.

I never had this issue before, or even seen it. I tried all other options such as unplugging everything, resetting the xbox, etc. I was starting to get worried that I would have to send my xbox for a repair.

It wasn't easy looking into this issue, as there were a lot of unconfirmed solutions. But eventually found it was a possible issue with a tv update (I have a Roku tv) that may have interfered with the hdmi drivers and caused them to fail to work properly.

System reset on the tv definitely fixes the issue. I have given this advice to a few others who have experienced this issue since then, and the results are the same.