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HELP! My PC Won't Turn Off

This all started about a week ago i think a couple days after i got my USB expansion card (ROSEWILL RC-508) i don't know if that has anything to do with my issue but that works fine but my computer doesn't turn off, windows shuts down but my computer doesn't turn off like the power stays on and sometimes even my fans ramp up. I think windows restarts rather than shuts down because an application that usually only comes on with my computer when i restarted it now comes on when i "shut down" my computer. basically i press the windows shut down button then my computer stays on so i flick the PSU switch off then when I turn the switch on again the computer comes right back on no matter how long its been off and if its on and i hold the power button it shuts down windows but the computer stays on and if I press the power button again then windows starts up again. I've tried so many things to fix this i took the expansion card out and restarted my computer, updated the bios (when i tried to update my bios with m-flash the system went to restart to boot into m-flash but turned off and didn't come back on so i turn off the PSU switch and turned it back on and then it booted into m-flash), cleared the cmos, took out my ram and put it back in. I don't know what to do and this is killing me someone please help me

Specs: https://docs.google.com/document/d/1Hf1xLxl5gJorSKg9p7lQxPHeUEqnNMwJ5y-vjkjY0fs/edit?usp=sharing and yes my system is originally from ibuypower but with some things upgraded and added

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Try setting "Restore after AC Power Loss" to "Power Off" in your BIOS. This is located under "Settings -> Advanced  -> Power Management Setup".

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5 minutes ago, Homeless Pineapple said:

Try setting "Restore after AC Power Loss" to "Power Off" in your BIOS. This is located under "Settings -> Advanced  -> Power Management Setup".

It is set to "Power Off" by default

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Just now, mitch2927 said:

It is set to "Power Off" by default

Odd, not sure why the PC would turn back on after a complete power loss. In the same menu, try enabling EuP 2013, this should be disabled by default.

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8 minutes ago, Homeless Pineapple said:

Odd, not sure why the PC would turn back on after a complete power loss. In the same menu, try enabling EuP 2013, this should be disabled by default.

I set EuP 2013 to Enabled and by doing that it also set DeepSx Power Policies from disabled to "enabled in S4-S5" then i saved it rebooted loaded windows then right clicked on the start button and shut down windows with no luck fans still spinning and led strip still on 

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I just shut down my computer to take notice of every little detail and all my fans shut off but one and my led strip stayed on but my motherboards "EZ Debug LEDs" was lit on CPU so I don't know if there might be a problem with my cpu or if it showed that because my pump may have turned off and my CPU stared to overheat 

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this led is red when my computer is on but off when my computer is in its "off state" (when i shut down windows but things stay on) 

product_3_20151103164024_563872f8057d4_LI.jpg

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27 minutes ago, mitch2927 said:

I set EuP 2013 to Enabled and by doing that it also set DeepSx Power Policies from disabled to "enabled in S4-S5" then i saved it rebooted loaded windows then right clicked on the start button and shut down windows with no luck fans still spinning and led strip still on 

Sounds like a fault with your motherboard, this is definitely not normal behavior. I understand that all BIOS options should be the default, but I'd take a look in Wake Up Event Setup and making sure that every Wake-Up Event is disabled.

20 minutes ago, mitch2927 said:

I just shut down my computer to take notice of every little detail and all my fans shut off but one and my led strip stayed on but my mobo's "ez troubleshoot LEDs" was lit on CPU so I don't know if there might be a problem with my cpu or if it showed that because my pump may have turned off and my CPU stared to overheat 

If the CPU EZ Debug LED is lit up, yet you can still boot into Windows, I doubt there is an actual fault. You might want to try downgrading your BIOS to 1.7 (2016-08-03). Otherwise, your motherboard may have developed an unrecoverable fault after the USB Expansion Card drew an unsustainable amount of power.

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15 minutes ago, Homeless Pineapple said:

Sounds like a fault with your motherboard, this is definitely not normal behavior. I understand that all BIOS options should be the default, but I'd take a look in Wake Up Event Setup and making sure that every Wake-Up Event is disabled.

its all disabled by default and i will try downgrading my bios, maybe not until tomorrow so ill @ you in my next reply probably tomorrow. thank you so much for your help so far

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@Homeless Pineapple I’ve downgraded my bios to 1.7 like you said with no luck my fan, led strip and case still stays on, you said that my expansion card may have drawn too much power, it has a molex connection but I don’t have it plugged in because I didn’t think it was necessary for some reason so do I actually need that molex connected 

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5 hours ago, mitch2927 said:

@Homeless Pineapple I’ve downgraded my bios to 1.7 like you said with no luck my fan, led strip and case still stays on, you said that my expansion card may have drawn too much power, it has a molex connection but I don’t have it plugged in because I didn’t think it was necessary for some reason so do I actually need that molex connected 

The Molex connector is there to provide more power to the card from the system. It could be like @Homeless Pineapple said, that you overloaded it without the molex conected, but there should be a failsafe or something that prevents that from happening...

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I tried a different drive with windows and the issue persisted so i can confirm that it is not a windows issue and it might be helpful to mention that my CPU was overclocked to 4.5GHz and since i downgraded my bios it rest my settings(overclock too) and i haven't noticed that red light on my mobo but the cpu light still comes on in the off state of my computer 

what would you guys suggest I do? replace my motherboard? or how can i confirm its a motherboard issue?

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22 hours ago, mitch2927 said:

what would you guys suggest I do? replace my motherboard? or how can i confirm its a motherboard issue?

You should be able to get a replacement Z170A motherboard on eBay for pretty cheap on the used market. I can't quite see a scenario that this problem is caused by anything other than your motherboard.

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CPU - Ryzen 9 3900X | Cooler - Noctua NH-D15 | Motherboard - ASUS TUF X570-PLUS RAM - Corsair Vengeance LPX DDR4-3200 16GB (2x8) Case - Meshify C

GPU - RTX 3080 FE PSU - Straight Power 11 850W Platinum Storage - 960 EVO 500GB, S31 1TB, MX500 500GB | OS - Windows 10 Pro

 

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CPU - Core i5-11400 | Cooler - Noctua NH-U12S | Motherboard - ASRock Z590M-ITX RAM - G.Skill Ripjaws V DDR4-3600 32GB (2x16)  | Case - Node 304

PSU - EVGA B3 650W | Storage - 860 EVO 256GB, Sabrent Rocket 4.0 1TB, WD Red 4TB (x6 in RAIDZ1 w/ LSI 9207-8i) | OS - TrueNAS Scale (Debian)

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