PC needs a moment to activate following power button press.
PC needs a moment to activate following power button press.
I altered the PSU and case on my PC, and now when I shut it down, I remove it from the power outlet and plug it back in after turning on the case. It takes about a second for it to start up again. If I leave the PSU connected while shutting it down, it powers on instantly when I press the case button. Is this typical? I thought the system might check everything before switching off.
I believe this is typical behavior.
Pressing the power button triggers a short circuit that instructs the PSU to activate and supply power to the system. It seems the PSU needs a moment to initialize after receiving the signal.
Additionally, according to what I recall, the system doesn't perform any analysis before it even begins spinning up. Only once the fans and other parts are operational and the board is fully powered does the POST process evaluate components before proceeding with the standard boot sequence.
Do you by any chance unplug the PSU eveytime you turn/shut down the PC? You don't need to do that, if you do.
That delay is probably partly because when unplugged from wall outlet the main bulk capacitors in the PSU are drained and when you plug it back in and press button it takes some time to charge the capacitors and the NTC trying to limit the inrush current adds some time to that. Although I think it is less than 1 full second, and seems like that to you in comparison with the immediate response of when it wasn't unplugged..
In some PSUs, for efficiency, after the initial start with the NTC (to limit inrush) there's a click which actually is a relay that is activated to take the place of the NTC (so the NTC won't waste energy as heat).