Question The motherboard light continues to flash when power-strip is switched off ?

[Monsignore]

The motherboard continues to flash while turning off the power strip equipped with a regular safety switch. With the power strip off, the PC does not start, but the motherboard light flashes.
I've already tried changing the power strip; thinking, with a certain logic, that that was the problem, perhaps by passing a little energy so as to turn on the LED approximately every 40 seconds. But is not so.
The pc with power strip off does not start, but the motherboard flashes every 40 seconds.
Why?

With the exact same hardware configuration and with the same power strip it didn't! Same exact setup for years and everything was silent when I turned off the power strip switch.

I only changed the power supply and the VGA and boom! It flashes even if the pc is isolated from the mains (at least I think it is isolated), how is this possible?
I am going crazy!
I'm also afraid that something will break.
Is it possible that the devil has entered the PC with the new power supply?
The new power supply is MSI MPG A850G PCIE5 850W, and I think it's not working well
With the old Cooler Master Silent Pro Gold 700 PSU it didn't happen that the motherboard light flashed, even for a whole night!

 

[rgd1101]

where exact on the motherboard that is flashing?

 

[Monsignore]

where exact on the motherboard that is flashing?

the red light that lights up is at the bottom, in the card manual it is indicated as Standby Power LED, which stays on whether the motherboard is running or off.
not one of the 4 leds : POST State LEDs.

Could there be electricity left in the power supply that doesn't discharge when I shut down your PC? and it doesn't discharge when I unplug the cable?

 

[rgd1101]

test with another power strip ?

 

[Monsignore]

test with another power strip ?

yes, done, it doesn't happen

 

[rgd1101]

not sure what doesn't happen mean.

so it working fine(without the flash) on another power strip?

 

[Monsignore]

test with another power strip ?

not sure what doesn't happen mean.

so it working fine(without the flash) on another power strip?

forgive me, I read wrong, I understood that you were asking me with another type of power supply (PSU) of the pc.
I observed and try to report in a simple way:

MSI (PSU) + power strip A/B - OFF + power strip connected to the mains = LED ON
MSI (PSU) + power strip A/B - OFF + power strip disconnected to the mains = LED goes out slowly, over time

CMsp (PSU) + power strip A/B - OFF + power strip connected to the mains = LED OFF
CMsp (PSU) + power strip A/B - OFF + power strip disconnected to the mains = LED OFF

CMsp (PSU) + power strip A/B - ON + power strip connected to the mains = LED ON

Legend:
MSI MPG A850G PCIE5 850W = MSI (PSU)
Cooler Master Silent Pro Gold 700 = CMsp (PSU)
power strip A ≠ B
Standby Power LED = LED ON/OFF

 

[Monsignore]

I'm thinking that the MSI PSU doesn't have an electrical insulation to the earth, probably there is some leakage of electric current in the system (perhaps it has always been there) and the MSI PSU passes the electricity in the circuit of the ground mass.
I don't know if the word "earthing" is used in English to mean what I'm trying to say

 

[rgd1101]

what the power strip brand and model? sound more like issue with the strip that continue supply standby power. got a tester to test?

 

[scout_03]

you could use something like this to test leak on power and polarity connection https://www.amazon.com/Receptacle-E...lectrical+outlet+tester&qid=1680880187&sr=8-4

 

[Monsignore]

what the power strip brand and model? sound more like issue with the strip that continue supply standby power. got a tester to test?

Explain to me what tests you would do and I will try to do them.

different types of slippers

I have three different types of power strips, I tested them with a tester; when I turn off the multisocket power strip button, neither positive nor negative passes, but the earth is not interrupted by the power strip switch.

 

[DRagor]

Instead of turning off power strip disconnect its cable from the outlet and see if Power LED behaves differently.

 

[rgd1101]

Instead of turning off power strip disconnect its cable from the outlet and see if Power LED behaves differently.

he did different scenario
https://forums.tomshardware.com/threads/the-motherboard-continues-to-flash.3802919/#post-22974921

 

[Monsignore]

I don't want to say nonsense, but it seems that there are ghosts inside the case.
Will I have to change power supply?

 

[rgd1101]

is just that the psu discharge slower.

 

[Monsignore]

is just that the psu discharge slower.

I did other tests by changing the power cable of the MSI MPG A850G PCIE5 850W, it does the same thing: it continues to give electricity to the system and the standby light of the motherboard remains on even for 24 hours, just disconnect everything from the network and the LED turns off in about ten seconds.

At this point: identical PC configuration, same slippers, same electrical socket, with the previous Cooler Master nothing turns on.
I wanted to do the test again.
If you have no other ideas I think I will return the product.
MSI let me down... and made me struggle a lot.

 

[rgd1101]

still have answer the model of the power strip or does it have(or test) stand by power

 

[scout_03]

with the 3 prong outlet tester could you check it directly from wall if it is not part of the issue since there something on the stip ground also what happens if system is plug directly to the outlet .

 

[Unolocogringo]

For a test.
Turn off computer.
Shut off power strip. No power to PC.
No press the power on button on the computer a couple times.
The first time should show a slight fan movement or brief flash of light from the LEDs.
The next couple completely drains the power supply capacitors.
Now wait and see if the problem persists and report the results.