Unplug all USB, HDMI cables then remove mains power for about 10 minutes. Only apply mains power and re-test.
If it's stuck still you go get repair estimates.
I was watching TV last night and my TV blinked to the life's good screen. After about 5 minutes I turned it off, when I press the power button I came back to the same screen "Lifes Good" . I power cycled it again and the screen said firmware reboot or restore, I try both about ten Times in 2 days. My LG47G2 is only a couple of years old does anyone know how to get it off the Lifes Good Screen. I cannot get to any other inputs or home screen. I checked the warranty it only has 1 year. "Lifes not Good for me".