the way I am thinking it is that the power supply is there not only for providing the hardware with the necessary power but also to save the hardware for all those sudden up/down, on/off allowance of the electricity. And if you see when we shut down the pc and unplug it, press again the start button to see that there is some electricity in the circuits. When restarting the pc this power is not leaving the circuits so they still "work"...
|