I have an Intel NUC single board NUC7i5DNBE that I brought in August 2018 and since then it was working fine. I started using it back after an year but have issues with it. It worked fine for 1 days but suddenly got switched off and wont boot at all. The green LED is solid but when I press the power button, nothing happens. I had this problem before with this NUC and another one that I have but every time it happened, I disconnected all the devices from it, removed CMOS battery and let it be for a day (once just 15/20 mins) and the NUCs started working again.
This time, this NUC behaves weird. After removing everything in the night and trying to start next morning, when I connected the power supply it switched on automatically (it was not happening before and I had to press the power switch) as soon as I attached the power cable. It looked all good but when I restarted the same problem appear.
I again waited the entire day and the same happened in the evening. After that I decided to wait more and then run a bios update. However, now if I connect the power cable, the white light blinks for a second and then goes off, the fan keeps running but the white light keeps blinking every 40/50 seconds but nothing happens. I tried pressing power button for 3 seconds but nothing happens. I tried removing everything and start the NUC but that also doesnt work. I have an extra CMOS battery but that also gives the same result.
I would really appreciate any help in this matter. Let me know if any more information is needed. The NUC has an SSD and 2x8 GB rams and I even though I have not checked them for any fault, its highly unlikely that one of these is the issue as the nuc doesnt boot even after removing them.
I have a suspicion that, because it sat for a year, the CMOS battery is exhausted. There are various places where you can purchase replacement CR2032 batteries fairly cheaply. Here is an example: https://www.amazon.com/dp/B08NZVFQRJ.
Hope this helps,
P.S. Note: Be careful: Some batteries - especially those intended for Dell PCs - are wired backwards and cannot be used (well, not without swapping the pins in the connector, but this is actually fairly easy to do).
Thank you for the reply. I had this spare battery https://www.amazon.com/gp/product/B07P5N564J/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
I tried it but it did not work. This one also is 2 years old and I never had to use it. I don't know if both of the CMOS battery I have are bad. I will get the one you showed and see if it works.
If the battery was no stored where it could somehow be shorted, it shouldn't lose enough power to matter. Perhaps it is not an issue with the battery. But, if you are going to continue and make sure - and you are adventurous - you can disassemble the packaging and replace just the raw CR2032 battery (that will lower the cost too).
I had already ordered the battery and it came today but the new battery too has the same issue. Every time I reconnect the CMOS battery, NUC takes longer to boot but boots and works fine. If I shut the nuc down and try to hit the power switch it doesnt work but reconnecting CMOS cable after leaving it for 10 seconds does the trick. This time I have also updated the BIOS but to no avail. If these any setting that tells the NUC to start from the power button instead of when the power supply is connected. The 'after power failure' in the secondary power settings is set as 'stay off' .
Please let me know if you have any other suggestion or else this would be my new normal :).
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