Ist Dir beim Lesen dieses Forums nicht aufgefallen, dass es englischsprachig ist? Was sagt denn die technische Dokumentation zum Blinkcode? Mein erster Verdacht wäre: Speicher / RAM.
This is an English speaking forum. Check the technical documentation for the blinking code. My first guess would be RAM. What kind of RAM did you buy and put into the NUC?
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Thank you very much to Lokutos for the information provided above.
Normally when the light blinks 3 times that indicates there is a problem with the memory RAM, so, please test the NUC with just one memory stick, with both sticks, one at the time, and also do the same thing with the other memory slot, this is to find out a if there is a possible problem with one of the sticks or with one of the memory slots.
The NUC works with DDR4-2133 1.2V SO-DIMM memory, as you can confirm on the following link:
Based on your last comment, it seems the problem was related to the memory itself, so, replacing it for the proper one should fix the problem.
Any questions, please let me know.