I went to watch tv on my shield as I do often but when I turned on my TV, shield and receiver, the screen was just blue (blue is the default color of no signal coming through av receiver)

I checked all ports and cords and no change. I turned the shield/tv/receiver all on and off again. No change.

I finally was able to start the shield in the fast boot menu (hold A and B on a USB keyboard plugged into the shield as you plug power into shield to turn on). I started in safe mode and I was able to get into the shield! All displays came up fine. I checked for update but no issues there. I set display settings to what they should be (4K at 59.9hz) which is the recommended. I rebooted and it happened again. Blue screen. All it shows at first is the nvidia logo for a while then goes to blue.

Any suggestions on how to fix this?