Question Should a desktop psu hold a charge even when it's switch is off?

[xtnt]

For example, if I am not to use the desktop pc for a long period, I will shut down windows as normal, and then turn the power supply's switch off, situated on the back of the supply itself. On a later date, I will switch the pc back on, using the power button on the front of the case.

On a couple of occasions, the system has turned on for roughly one second, and then back off. When I check the system, each time I'll realise that I've forgotten to turn the switch on the psu itself back on. It has only done this on a couple of occasions. Although I haven't noted whether the wall switch is always on when it happens (most likely), it's always plugged in to the wall, and the psu switch always off.

Should a psu hold a brief charge in this manner? I am using a rog 850w gold. My previous pc's supply never did this, and it used an Enermax 600w psu (this was in the early 2000s). I suspect they are average quality, but it lasted around ten years. The new system with it's rog psu is only a couple of months old. So I question the psu's longevity too. Other than that however, it does work with no issues. Thanks for any info

 

[MrN1ce9uy]

There are capacitors inside the power supply that store energy. That is normal. Better power supplies have better capacitors.

 

[stonecarver]

On a couple of occasions, the system has turned on for roughly one second, and then back off. When I check the system, each time I'll realise that I've forgotten to turn the switch on the psu itself back on

If you have lived in the 70's when you would turn off a high power amplifier and leave the pre-amp still playing the amplifier would still keep playing music in the off position for about a minute than fizzle out. The power supply on our PC's acts the same way.

 

[xtnt]

I wonder if this gives hint towards capacitor or psu quality, in comparison to the older system with it's supply that never did this? I would assume still storing energy in this manner isn't proof of anything, although I still wonder why it doesn't lose it after switching off. Perhaps it just takes time. Switching off in this fashion regularly if it ever did so, would probably not be healthy. I missed the 70s (just)! Thanks