Hello Kwyjibo, first of all I would like to apologize for so much trouble you are having with your NUC.
There are a few things that may have caused this behavior on your device. It might need a BIOS update, so I recommend you to please check which is the current BIOS and update it to the next available version.
When there are a few BIOS versions between the original and the latest, it is better if we install each of them. Sometimes, the latest BIOS do not include the fixes of the previous ones.
You can also try a clear CMOS. Please check the following picture with the procedure.
Then, in regards to the operating system let me inform you that we this specific NUC support Windows 8 and Windows 8.1 64-bit only. There is partial support for Windows 7. We have received comments from customers reporting compatibility with Linux flavor OS, however Intel has not validated them.
If you continue having issues you can always contact our technical support team for additional troubleshooting. http://www.intel.com/p/en_US/support/contactsupport
Sorry it's been so long since your reply, I had a bereavement and had to put everything on hold.
Unfortunately, I cannot power on the device to check the BIOS or anything else. I cannot clean the CMOS. My 2nd post links to a video of the NUC problem. The link has since expired, so here it is again - http://bit.ly/TJTcbb
This device is just causing frustration since the day I received it. I am normally fairly patient, and I am still trying to be with this, but it is getting harder.
Is there a way of physically resetting the CMOS?
Since the last post I have purchased new RAM, again Low Voltage (1.35v) and I am still having the exact same problem.
Any help will be gratefully appreciated, as at the moment I feel like I just bought a box that powers off.
Would you please let me know how the NUC behaves when there is no USB device attached to it?
If the behavior persisted, please contact our customer support department for additional information on replacing your product