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the capacitors hold the charge even after you unplug it from the wall. that would be a reason you don't want to.
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This is partially true, mainly back when powersupplies had heavy transformers and banks of 'caps'. Even so, modern power supply makers have bleed-off resistors that prevent the caps for holding a long-term charge.
I have worked with 1-15 Farad 24Vdc caps wired in a many different configurations. We even used that as a makeshift arc welder.
Your P/S will not kill you, just make sure that it's unplugged from the wall. Leaving it plugged in may kill you.
-SF