Dad has managed to get a blue screen twice today.

OH. MY. GOD!
Son?
Not you too!
I fixed the TV about 930 pm. Dad had the receiver up to channel 9-hundred something. We only have basic - so clearly we don't have 900 channels.
I told dad: The remote is not a toy. It is not for experimentation. Use it for what you need: On/off, channel up/down, volume....well, dad just reads the captions. He can't hear well.