PC will not power down and takes 5-10 minutes to startup

[coryv35]

So I have searched and searched the internet for an answer and nothing came up that's helpful.

I built my first PC about 2 months ago and this has been an ongoing problem from the start. When I hit the shutdown button in windows it does nothing. I have tried Ctrl+alt+del and clicked shutdown from their and it had a loading sign on a bluescreen and lags forever. The only way I'm able to get it to shutdown is by holding the power button. Everything is still running, LED lights, fans ect but the monitors signals out. Besides that when I start up it takes about 5-10 minutes to hit the MBs splash screen and then it actually loads up windows.

What I have tried, replaced the MB for 3 total tries. MSI z270 M7 x2, now I tried z270 M5 x1 (latest) and same issues. Replaced i7 7700k with a new one. Swapped out my SSD for a new one. Windows was a clean install and I have reinstalled it multiple times over the course of trouble shooting. Updated bios, updated all drivers to latest from manufacturer websites, tried starting It without my 2 hhds connected. Called MSI for troubleshooting. They told me to send the MB back for a new one.

I am stumped as to what could cause this as I clean install Windows Everytime I replaced the motherboard

Specs
MSI z270 M5 gaming enthusiast
MSI Geforce 1080ti
i7 7700
4x Corsair RGB 16gb

 

[Colif]

checked the ram? run memtest on the ram sticks
tested drives in another PC? run hdtune on them and check health? are they new?
tried another PSU?

what are other parts of PC?

not caused by:
CPU
Motherboard

tried a minimalist install of 1 ram stick, no gpu, 1 hdd?

try turning off fast startup - https://www.tenforums.com/tutorials/4189-turn-off-fast-startup-windows-10-a.html as it might be the PSU doesn't support the Win 10 power states. See if it makes any difference.