I see televisions that get smashed or they are untouched. I only know about the electric cords value. What is inside that is worth smashing it to get?

Also, when it comes to computers and circuit boards. What am I looking for? What should I strip out? After I strip out escrap then where do I sell it. My scrap yard doesn't buy it.

Thanks for any input. I'm pretty ignorant when it comes to the computer stuff so ANY info will increase my knowledge.

ScrapAddict