NUC8BEH Won't Turn On Despite Getting Power

[Matt51]

Just got a NUC in the last 60 days. Worked great till today when I entered my office and found that it was off and pushing the power button would not turn it on. (LED does not light and monitors unresponsive)
Tried unplugging and discharging power by pushing power button then plugging in after some time. No change in behavior.
I can see an internal LED is lit through the USB port when plugged in so I believe it is getting power.
Does anyone have any ideas for next steps?

[n_scott_pearson]

The fact that the (green) Standby LED is lit only indicates that the power supply can provide the trickle of standby power. It does not mean that the power supply can deliver full power when requested. I thus suggest that the first thing you should do is find an alternate power supply to try.
If the power supply is working, then either some part of the hardware has failed or the BIOS is in a bad state. Testing for the latter involved three steps.
First, power on holding the power button in for three full seconds. If this results in power-on occurring, wait for the power button menu to appear before continuing.
If this doesn't work, try opening the NUC and moving the yellow BIOS jumper from pins 1-2 to pins 2-3 and then try powering on.
If that doesn't work, final thing to try is clearing CMOS. This is done by unplugging the CR2032 battery for 15 minutes. This battery is on the processor side of the NUC's board, which may mean removing the board from the chassis.
Hope this helps,
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[Matt51]

My father in-law brought over his Nuc and I tried the power supply troubleshooting tips. It's not the power supply.
Building my confidence to open it up but I'm a noob with anything hardware. Are there any youtubes I can watch for the next steps of testing the BIOS?

[n_scott_pearson]

There are all sorts of NUC videos on YouTube. For example, do a search like "Intel NUC disassembly".

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[ThailandNoobie]

Edit: I just got blue light (stay as a continuous blue light on the front, fans working nothing else doesn't, no signal)

 

Hey I just got this issue, I changed bios battery (PSU wasn't connected) and after put everything together got green light on MB but not turn on. I tried cmos pin too, no changes, I took battery out for 15min, no changes. What might be problem? I have disassembled and assembled several NUC machines, so I knew what I was doing. Something happened to bios? And of course battery was taped on the tiny lid under the fan and it went off too, can do something? I did put it in same position. I tried to disambled and assembled several times, no changes. Thanks for advanced

[James452]

The same just happened to me. The board seems to be receiving power but pressing the start button does not power up the CPU. Please let me know if you find a solution. Kind Regards.

Prepaid Gift Balance

[n_scott_pearson]

@James452, subscribe to this conversation and you will receive notifications for all subsequent posts. If you have email notifications enabled, you will also receive email notifications for every subsequent post.

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[n_scott_pearson]

Did you verify the pinout of the battery (via wire colors)? There are many for sale that are wired the opposite way (thanks Dell).

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[ThailandNoobie]

Darn, i didn't check it, but i did put the old one back because it still had power.
I have to check again tomorrow if that was the case. Did I ruin the NUC if it was opposite wiring?
Thanks for the answer

[n_scott_pearson]

No, it won't hurt (well, other than the CMOS will be continually resetting as a result).

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[ThailandNoobie]

Edit. Yup someone change the product so wired opposite.

What should I do now to get it work, cmos is zeroed with this wrong cable and with cmos pin also 

[n_scott_pearson]

Well, the simplest thing is to pop the pins out of the connector housing and put them back in the opposite position. I use an exacto knife to pry up the plastic arm just enough that the pin can be pulled out.
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