The caps in a power supply usually bleed out across the rest of the circuit within a minute. Not much to worry about here.
Where you will see large capacitance that can remain stored for long times are in CRT type monitors and TVs. The voltage in monitors can hurt lots and in the right conditions can kill.... do some research on that... there are several threads here addressing this issue. There are several members here that have been bit and still live to laugh about it.
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