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Solved My new AMD Ryzen 3900x system keeps turning itself back on after full shutdown

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Hello all,

I am having an odd issue with my new motherboard/system. I just swapped out my Threadripper 1950x and Gigabyet x399 Aorus Gaming 7 motherboard for a Ryzen 3900x and Gigabyte x570 Xtreme. So far, I have no issues with the performance. I have not done any overclocking, and everything has been stable.

Here is my full parts list vis PC Part Picker:
https://pcpartpicker.com/b/BqHhP6

I have installed the latest Bios version; F10 from Gigabyte's website. I also have downloaded the latest chipset drivers and individual drivers for all the components that are Windows 10 1909 supported, as I am running Windows 10 Pro version 1909.

One 3 known occasions now, my system has powered itself back from a full shutdown state. I powered it down before heading out for a bit. and when I came home it was powered on. When I logged into my main user account, task manager said system up time was 4 hours and some change, which meant it kicked on shortly after I had powered it down.

Last night I had done a full shut down, and while working on another build for a friend, my system powered itself back on. This time I actually saw it do it. At this point, I started researching what could been causing it. Here are some steps I have taken to try to prevent it from doing it.

In BIOS, I double checked to make sure fast boot was off, which it has been since I installed the BIOS. I turned off 'Wake Up On LAN" after the first time it turned itself back on, but the issue continues. Since it turned back on last night, I have gone into Windows Power Settings and changed the following under the Sleep tree:
-Sleep After: Never
-Hibernate: Never
-Allow Wake Times: Never

I also went into device manager and turned off 'Allow this device to wake PC" under the mouse and keyboard settings. After I made this changes, I clicked on the start icon, and click 'Shut down". It shut all the way down, and I tapped on my keyboard and mouse a little bit to make sure they where not going to trigger a boot up. It stayed powered down, and I left the room. Later on when I came back to the PC, and it was booted up again and task manager said it was up almost 4 hours, which means the system stayed shut down for about an hour and a half, if that, before it booted back up.

Does anyone have anything else I could try? I would just keep the kill switch off for now, but I really don't want to do that. I know the Ryzen 3900x and x570 is still relatively new and there is not a lot about this board online yet. I have not attempted to contact Gigabyte yet.. That's my next step on Monday when they have support lines open.

I have stopped my PC from randomly booting up now. I am not sure which of my connected devices was causing it, but after talking to Gigabyte support, they suggested that I enable the ErP setting in the bios. This has seemed to solve the issue, as my pc has been shut down 3 times since then without any boot ups, including an over night shut down.
 
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