I've wondered that myself. I've got an old copper block not doing anything. The resistors in the supply will generate a good deal of heat as well, but I'm not really sure if that would be enough to cause ptoblems.
One way to find out would be to run an old supply without a fan for a little and touch the parts inside to see how warm they are. Of coutse if you didn't discharge it completely and touched the wrong thing you'd be in for a lot of pain.
Anyone ever taken thermal images of a power supply?
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