MSI EZ Debug CPU light turns on after my PC Shutsdown?

[Pie_Inspector]

I noticed that when I shutdown my PC after the shutdown process has finished the psu, heatsink and sometimes the case fans stay on, also the motherboard led and the debug light. I built the PC myself in Sept 1 and it has been running like this everyday since I built it. Once the PC starts the post process the EZ debug light goes off and the PC functions completely normal. I have been just turning off the switch on the back of the PSU to kill the power to the components ever since I have noticed it.

Things I have tried:
-Enabling the EuP setting in the BIOS
-Changing what the Sleep/shutdown buttons do in Windows settings
-Disabling fast boot in windows settings
-Making sure no devices are set to wake up the PC

Thanks in advance for any advice

[_I_]

its normal on most boards to have a diag led on when its powered

[Pie_Inspector]

_I_님이 먼저 게시:

its normal on most boards to have a diag led on when its powered

But that mobo led does not turn off when the system is shutdown and the CPU EZ debug light appears.

[_I_]

yes, but its stil powered when 'shut down' or before its 'turned on'

atx power supplies always havea +5vsb and +v rail powered and waiting for a turn on signal from the board to turn on the rest of the power rails

[Moose Rancher]

My power source is an EVGA SuperNOVA G2 550W 80+ gold certified fully modular. My power draw from my PC should be less than 280W, I bought this power source in case I wanted to upgrade certain components in the future.

It seems like a really nice power supply, so unless something malfunctioned I think the power supply is more than sufficient to support my PC for a long time.

I'm not sure what you mean, _I_, but this is not normal functioning of the PC/powersource/mobo. When I power off the PC, the fans go from a PWM-mode (operating at well below max speed because my idle temps are 30C and dont ever go above 55C with multiple applications open) to running at 100% full speed when the PC is supposed to be "off". For about a year prior to when this phenomenon started, the fans would fully turn off whenever I powered down the PC and there were no signs of activity. I do not agree with your assessment, in this case, that this is normal operating behavior.

I appreciate your responses, and I'll report back after I start replacing various components to see which one of them is the culprit. However, since my CPU temps are fantastic and the PC runs well I do not think a new CPU is in order. I'm going to start with a new mobo, as I think it's likely not a coincidence that both of our mobos are MSI and we are experiencing the exact same issue. Hopefully a new mobo sheds some light onto this issue :D

[chrzczonepaliwo]

I have the exact same problem! My MB is B450 Tomahawk, I sent it to MSI and they didn't find anything (warranty). The thing is that the problem starts somewhere around 1 or 2 days after I assemble my PC.
During the absence of my b450 tomahawk i got another msi MB, B450 A-PRO and everything was fine. When I switched back to my motherboard after they sent it back to me, the problem occured again.
I tested everything and the problem stopped only when i got a new MB.

[Double Deez Nuts]

Pie_Inspector님이 먼저 게시:

the debug light

its dead bro time to buy a new one

[Pie_Inspector]

Well it's still working, built the PC almost 2 years ago from now.

[chrzczonepaliwo]

I wrote an e-mail to the MSI Polish support, and after checking if all the settings are correct, they sent me a link to an experimental BIOS version - after I installed it the problem disappeared...

[CravenCoyote]

You might be able to work around this by manually turning off your system rather than having Windows power it down for you. Similar to the days before auto power management was a thing, on shutting down Windows it'd give you a message saying it was safe to turn off your computer.

Here's an extract from https://windowsreport.com/safe-turn-off-computer/


Head towards the Start menu and open the Control Panel.
Navigate to the search box that is available at the right hand corner of the Control Panel window and type “group policy“.
You will see a list of search results and click “Edit group policy“.
A new windows “Local group policy Editor” will be opened, select Computer Configuration >> Administrative Templates>>System.
Double click “Do not turn off system power after a Windows system shutdown has occurred”, it will open a new window.
On the left hand side of the screen you will see three options: Not Configured, Enabled, and Disabled.
Select “Enabled” and click “Ok” to save the settings.
Finally, press Win+R key to open Run and type the following command and press Ok:

shutdown -s -t 0
Your system will now shut down and you will see the message “It is now safe to turn off your computer”.

I haven't tried this myself, I've never had power down issues. But it could be a solution.

[Pie_Inspector]

do you think that once I hit the power switch on the case it will send the command to turn off the power to the motherboard?

[CravenCoyote]

Pie_Inspector님이 먼저 게시:

do you think that once I hit the power switch on the case it will send the command to turn off the power to the motherboard?

That's my assumption :)

[Rogue_0zzy]

Pie_Inspector and Sinpay, I’m currently having the same issue with my b450 tomahawk that I only purchased a month ago. Did yous ever find a solution to the problem? Thanks

sinpay님이 먼저 게시:

I have the exact same problem! My MB is B450 Tomahawk, I sent it to MSI and they didn't find anything (warranty). The thing is that the problem starts somewhere around 1 or 2 days after I assemble my PC.
During the absence of my b450 tomahawk i got another msi MB, B450 A-PRO and everything was fine. When I switched back to my motherboard after they sent it back to me, the problem occured again.
I tested everything and the problem stopped only when i got a new MB.

[Pie_Inspector]

Rogue_Ozzy님이 먼저 게시:

Pie_Inspector and Sinpay, I’m currently having the same issue with my b450 tomahawk that I only purchased a month ago. Did yous ever find a solution to the problem? Thanks

sinpay님이 먼저 게시:

I have the exact same problem! My MB is B450 Tomahawk, I sent it to MSI and they didn't find anything (warranty). The thing is that the problem starts somewhere around 1 or 2 days after I assemble my PC.
During the absence of my b450 tomahawk i got another msi MB, B450 A-PRO and everything was fine. When I switched back to my motherboard after they sent it back to me, the problem occured again.
I tested everything and the problem stopped only when i got a new MB.

Never found a solution to the issue. I still suspect that it is the motherboard causing the issue. So when I get another motherboard when upgrading my CPU I'll see if the issue goes away.

You may want to look into getting the motherboard RMA'd to hopefully receive a new unit.

[aadhishshah011]

I have the exact same issue4 has anything helped yet???

[Moose Rancher]

aadhishshah011님이 먼저 게시:

I have the exact same issue4 has anything helped yet???

I joined this thread years ago because my PC (with a MSI Z270 SLI motherboard) started having this issue randomly about a year after I built my PC in 2017. I'm still using the same mobo, the problem still exists, and it has not progressed any worse or affected my computer's performance in any obvious way.

From years of following this thread and watching as more and more people have had this same issue of the EZ debug light coming on during the PC power down phase (as the computer refuses to power down completely on its own) I have concluded that the most likely situation is that there is some MSI manufacturing defect that seems to happen in a variety of their mobo models. I've upgraded a few different things in my PC over the years, but not the cpu or mobo. Since the common denominator between all of our computer's is the MSI branded mobo, I'm inclined to believe it's a mobo specific manufacturing defect.

Years ago I reached out to MSI customer service and tech support, and they basically gave me a non answer, telling me that they're both unaware of the defect, and also unaware of how to solve the problem.

While I can't guarantee it, my gut tells me that if I were to upgrade my mobo, this problem would go away. I haven't upgraded the mobo yet because of the hassle of dealing with the Windows license, as well as the hassle of basically needing to re-build the computer. Like I said, the computer still functions just fine, but I have to flip the power switch on the back every time I turn the computer off or on.

I think the biggest takeaway from this multiple years'-long debacle is that I won't be purchasing an MSI branded mobo again :/