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Static electricity – the stuff that makes your hair stand on end when you comb it on a hot day. Chips are relatively safe while they are in the circuit board and earthed through the computer, but technicians wear a special strap of conductive material clopped to the computer chassis (or to a connection on a special anti-static work-bench) when they are taking a computer apart.
Another common problem is coffee or soft-drinks spilled into the keyboard of over the circuit board.
I once fried a computer power supply by working on it wearing a watch with a metal strap.
Another common thing is a fan failing, so the computer overheats. Some computers have a special temperature sensor and will shut down before damage is done.
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