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I've opened a power supply before to replace a noisy fan. I have heard that if you unplug it from the wall and then try to power on the computer it will help discharge the capacitors. When I did it you could hear the computer try to start for half a second. I was still careful not to touch anything. I think it is like anything else, it can be dangerous, but if you are careful and treat it with respect you should be ok.
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