Unusual problem on AC disconnect

[gianmarco13]

Hi, I am experiencing an unusual problem when I disconnect the AC from the PC, more precisely after shutting down the PC correctly if I disconnect it from the AC and then reconnect it after a few hours, at the next startup in the best case Windows starts but it is very slow in when the CPU operates at very low frequencies (about 300Mhz*), in the worst case, however, the Bios tries to restore Windows, showing the Intel Nuc screen several times, and after several minutes (even 20 minutes) it starts Windows with the same problems as the best case (CPU low). Furthermore, the problem does not always resolve itself after a restart, sometimes 3 or 4 restarts are also necessary for the PC to normalize. This is very annoying as I happen to disconnect the PC from home to take it to the office and continue working there.

I point out that as a first attempt I disabled Windows fast startup but this did not solve the problem.

System Information:
- Operating System: Windows 10 pro 64bit (vers.21H2, build.10.0.19044);
- Serial Model: NUC11TNBi5, vers.M11904-403;
- Bios: vers. 0064.

*Allegate:

[AndrewG_Intel]

Hello gianmarco13

Thank you for posting on the Intel® communities.

In this case, we recommend trying first the following steps:

1. Access the BIOS for the Intel® NUC (press F2 during POST)
2. Press F9 to restore default settings.
3. Press F10 to save the settings and exit.
4. Access the BIOS one more time.
5. Verify that "Intel® Turbo Boost Technology" is enabled under Performance > Processor and make sure "Active Processor Cores" is set to ALL.

If the behavior persists, could you please confirm the following details?

1- Did the Intel® NUC work fine before or are you experiencing this behavior since the first day that you have the device?

If this worked fine before, were there any recent hardware or software (Windows, BIOS, driver, or software updates) changes that might relate to the point when the issue started?

2- Are you using the original power adapter that came with the Intel® NUC?

3- "NUC11TNBi5" refers to the board model. Just to make sure, are you using just a "NUC board" on a custom chassis? or are you using a regular Intel® NUC mini PC/Kit?

Please run the Intel® System Support Utility (Intel® SSU) to help confirm the actual model and to gather more details about the system:

• Download the Intel® SSU and save the application on your computer
• Open the application, check the "Everything" checkbox, and click "Scan" to see the system and device information. The Intel® SSU defaults to the "Summary View" on the output screen following the scan. Click the menu where it says "Summary" to change to "Detailed View".
• To save your scan, click Next and click Save.
• Once you have saved the file (.txt file), please attach it to your reply.

To upload and attach a file, use the "Drag and drop here or browse files to attach" option below the response textbox.

Best regards,

Andrew G.

Intel Customer Support Technician

[AndrewG_Intel]

Hello gianmarco13

We are checking this thread and we would like to know if you need further assistance. Please do not hesitate to contact us back if you have additional inquiries.

Best regards,

Andrew G.

Intel Customer Support Technician

[AndrewG_Intel]

Hello gianmarco13

We have not heard back from and we also noticed that you have opened a phone support case with us where Intel® Customer Support is providing assistance. Therefore, we will close this community case and the support will continue through the phone support case. Thank you.

Best regards,

Andrew G.

Intel Customer Support Technician

[gianmarco13]

Hello AndrewG,
I must apologize, I confirm that I have opened a request for telephone assistance, but after having posed the unusual problem due to the disconnection of the AC, I have encountered a much more serious problem and that is that of no starting unconditional of the device, so I apologize again for having abandoned the post. The case, however, was followed step by step by his colleagues who, given the serious circumstances, offered me a refund