your computer could demage when you block the fan under it,and when you use your computer.
Well do you want the short answer or the long answer? The short answer is no. The long answer is noooooooooooooooooooooooooooooooooooooooooooo!
No
I have long silky and damage hair.
No, many people will recommend to turn it off if you are leaving it unused for a very long period of time, but it can not actually damage the computer.
brain damage
Brain Damage Malnutrition
As long as you play through reputable sources you will be safe. I.e. Steam.
Brain Damage Malnutrition
Cirrosis and possible brain damage
Ive heard you can put it in the freezer or in rice?
If you're using an inferior chair with your home office, consider switching to a dedicated computer chair to make sure you're posture is good and comfort is maintained. A bad chair causes long term damage.
I am using my computer after around 96 hours of my cataract surgery; and it's fine.