Try unplugging the TV for a min or two and then pressing the physical power button on the TV itself for 30 seconds. Then plug TV back in and use the Power button again on TV. (may require long button press to power on.)
There is a Factory Reset button on the TV itself as a final thing to try (press and hold 15-20 secs), but usually just use as last resort.
If you are receiving no picture and the red LED is flashing, normally either a LED strip light or an I/O (driver board) issue needing replacement, though.
Of course, try the physical power button on TV first though to rule out remote issue.
Roku Community Streaming Expert Just another Roku user... I am not a Roku employee. Insignia RokuTV, Ultra 4660, Premiere+ 3921, Express 4k+ 3941, Streambar 9102
Good afternoon I tried turning the TV off and it did not work but the red light is flashing there was also a light flashing on the TV itself I don't know what that means but I definitely need help thank you for your time