Why is it important to not stack boards on top of each other when taking a computer apart?
You could accidentally dislodge a chip this way.
Computer that does not work but has personal info on it so what should you remove before getting rid of it?
Rub a big magnet across the mother board... if you don't like that, take the computer apart and phycically break all of the green boards. If you are worried about you personal information getting out (you should be) than you should destroy the computer and buy another one. Private information can be restored by the next user or store employees.
Grace Hopper was a computer scientist in the US navy who discovered in the late 1940s that something was wrong with one of their computers (which was called Mark II). Some technicians ended up taking it apart and finding the problem was that a moth was stuck in a relay. She pasted the moth in her logbook and computer "bugs" were born.