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please help issue with SuperMicro H12DSi-N6

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Old   January 26, 2022, 21:40
Default please help issue with SuperMicro H12DSi-N6
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Abelardo Jara-Berrocal
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Hi I hope everyone is well, I have a supermicro H12DSi-N6 and installed two Epyc Milan on it

I connected CPU FAN 1 (Noctua 14) to fan 2 connector and CPU FAN2 to fan connector 6

the connectors to front panel are right, however as soon as I give power to the motherboard, system turns on without me pushing the on button, the CPU fans start spinning and the LED2 turns on.

Do you know what could be wrong? are the CPUs burned or could be the culprit.

I can access the BMC web UI and on the CPU the CPUs and memories are listed as green but the fan tab shows no fans

the fans are spinning so i know they are working

please help
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Old   January 27, 2022, 04:22
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These boards should have a bios setting that determines what happens when power is connected. Turning on immediately -without pressing the power button- is one possible value. So far, nothing to worry about.

What exactly seems to be the problem? Does the system not boot?
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Old   January 27, 2022, 13:21
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Hi Flotus
I hope you are well

im really scared, but ill not panic

so no the system does not boot.

1. both the BMC led and the power LED (front panel) start flashing upon motherboard getting power (im not using a supermicro case but a different case which worked on a similar system)

2. after some seconds fans starts spinning and LED2 starts flashing (according to manual it says fan error?)

3. the BIOS does not show on VGA

4. i tried doing ipmitool list sensors from a laptop and it lists sensors but shows "na" for all of them

5. when i access the BMC web ui it shows the two processors and all the DDR as green (recognized) but the sensors and fans tabs are empty (shows NA there too)


im freaked out hopefully CPU is not burn
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Old   January 27, 2022, 14:54
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All right, nothing to panic about at this point. You are not the first person with these issues. Damaging the CPUs is pretty hard to do anyway after they have been installed.

The system inventory only updates after a successful POST. So don't get hung up on what is shown there currently.
And SM boards reporting fan failures is normal with most desktop fans. The board expects server fans at high RPM, and thus reports regular fans as below critical. This is something that can be fixed later, after you get it booting. See Weird Fan Behavior For H12DSi-N6 Motherboard

Let's go about this methodically, step by step
1) Take the board out of the case, and set it up with a minimal configuration, on a non-conductive surface like a cardboard box. In this case both CPUs installed with 1 DIMM each. No storage, no graphics card, no other PCIe devices.
Why: reduces as many points of failure as possible, including a short on the back of the board from some misplaced standoffs.
2) Full CMOS reset. See page 44 in the manual. Remove power, remove the CMOS battery, then short the "JBT1" pads with a screwdriver or similar for a few seconds. put the CMOS battery back in, and connect power.
Why: who knows which bios settings might prevent successful post at this point. better to start from scratch.
3) Check the jumper position of "JPVGA1" to make sure the onboard video output is actually enabled.
4) Connect a monitor via VGA, make sure the monitor input is actually set to VGA, and power on the system. Or skip that and monitor progress via BMC/IPMI.

Now the system should POST. If it still doesn't, you should have access to some post code errors in the BMC web interface. Keep in mind that these boards can take a few minutes to post, so be patient. Especially after changing the hardware, it will do several cycles before turning on properly.
You also mentioned LED2 blinking. is it blinking red or green? Green means everything ok, red indicates the fan error mentioned above. Which is still nothing to worry about at this point, and should not prevent successful POST.
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Old   January 28, 2022, 01:10
Default thank you so much Flotus
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So I did what you suggested but I also realized that the DIMM had to be populated according to the manual

So after doing that the system had a succesful POST

System is working now. I am bit scared to touch it now because caused me lot of worries

Thank you so much for your advice and help, all my grattitude
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Old   January 28, 2022, 04:28
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Excellent, now we reverse the process step by step, checking if the system posts each time

1) add the rest of your memory according to the suggested population in the manual
2) add storage
3) before putting the board back into the case. make absolutely sure that all standoffs match with a mounting hole on the board. And that there are no other obstructions that might contact the board on the backside.
4) add whatever other devices you intend to use
5) if you are using a graphics card, go into bios, switch the vga priority option to offboard, and check if you get graphics output from the GPU
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Old   April 7, 2022, 19:05
Default Thank you flotus1 a lot
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thank you flotus 1 a lot
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