The problem is as this products is more than 4 years ago, we really dont have replacements for this one.Warranty already passed and i do not recommend you to send it a second time, because this time you will have to pay and is not sent to Spain(the EU repair service is in Germany now, not in Spain). And im sure im this case it would be sent sent to Hong Kong, i would need to ask if we still repair this model. I will answer you tomorrow.Because it seems something may be with the motherboard.And the shipping would cost a fortune for you and also the repair, and the time.
Have you tried to take to a local repair shop? Maybe its not even the drivers, but a conector?repair shops see computers everyday, maybe they had similar cases with other Mini Pc or computers or even sometimes they do tricks and things finally work. I would do that in your case
I have been searching in the forum look at this,it may seem stupid but trying…: