Intel® NUCs
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13491 Discussions

NUC8i7HVk will not boot after disconnected from mains for 3 weeks


Due to electrical storms at this location I frequently put this computer in the safe when I am away for an extended period.

This time no response to power button. No LED or fans.

Power brick verified ok.

Disconnected CMOS battery and cables for change.

Attempted BIOS revocery/upgrade (ver67) on FATA32 formatted usb drive with security jumper removed.......nil response.


I recently upgraded to Win11 and had no issues.

My BIOS is at version 64 as far as I can remember


During troubleshooting over a few days it booted once spontaneously but was unresponsive.

No signal to monitor so could not change or check anything.


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3 Replies
Super User Retired Employee

Your CMOS battery may be losing its charge. You can purchase a replacement fairly cheaply (I see lots on NewEgg and Amazon and elsewhere). Here's an example:

Hope this helps,


P.S. Note that some Dell PCs use a battery with the opposite polarity, so make sure that the battery you choose matches connector color positions with the one in your NUC currently.

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Well, you are true, my friend purchased this **bleep** sometime back and now regretting it   

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Thanks Scott, I had already installed fresh cmos battery with no success.

Fully disassembled computer, cleaned with compressed air.

We live in a maritime atmosphere with humidity over 90% for last 2 months with the floods so I suspected moisture salt and dust.

Unfortunately this did not work.

I left it fully assembled for a week plugged in and then one day as I walked past it was running.

Only thing missing was the PIN to access it.

Everything else running normally.

Odd that it self started.

I have flogged it since then, throwing every test at it and can not produce any faults.

It sleeps, hibernates etc  ie no fault with power button and system suspension/activation.


Thanks, Scotty P


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