Why don't computers run on coal?

What do you mean, dont?  They still do.  There are still coal burning power stations around the country.   Your question is as wrong as asking "Why don't computers run on nuclear power?"    They do.

In some parts of the world, it does. Coal not only powers computers in the UK, it is also used to manufacture the computers themselves.

"Little minds don't see the big picture."

dude coal will kill you. but I agree the chords are ugly

It probably dose but the reason you don't want  to hear about it so they said nothing.

 Oh but they Do..... 80% of US electricity is produced by coal burning power stations.

Computers do not run on coal because.............

Or brains, apparently.

They do, what do you think they use to heat the steam with that turns the turbin to make the electric with!

Overheating would become even more of an issue.

Great plan. We could make them out of asbestos.