A model of PS/2 I worked on when I was a teenager had mains voltage across two exposed terminals behind the big power switch. I discovered this when dropping a screwdriver across them.
Had a power supply open to replace the fan, turned it on while open to test if it was wired up correctly. I flicked the switch with my thumb, with two fingers inside the case to stabilise it as the fan was loose. Those fingers briefly touched across the back of the switch and I got 240v mains straight to my hand. Luckily it caused my whole arm to contract so my hand couldn't seize up around the terminals!
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A model of PS/2 I worked on when I was a teenager had mains voltage across two exposed terminals behind the big power switch. I discovered this when dropping a screwdriver across them.
Had a power supply open to replace the fan, turned it on while open to test if it was wired up correctly. I flicked the switch with my thumb, with two fingers inside the case to stabilise it as the fan was loose. Those fingers briefly touched across the back of the switch and I got 240v mains straight to my hand. Luckily it caused my whole arm to contract so my hand couldn't seize up around the terminals!