The comments are horseshit. You can unplug the PC, then press the power-on button, and THEN all the capacitors are definitely empty. The fans may even spin a little.
But they don’t actually need to be empty, and it does not have a damaging effect. That’s why you can turn it off and on as quickly as you want to, and if you really have some problems (never happened in my life, but always do it before you open it), you can do it as I described. Unplug and hold the power button.
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