Hello Thank you very much for help. I have a laptop service, but unfortunately I'm not good enough to deal with some problems. I spend too much time in front of the internet for a long time to find a solution, but not always with a good result. Unfortunately I am a self-taught amateur. Thank you very much for your help. Are you able to help me solve the problem with dell e7240 to which you have to assign a servicetag, Macbook pro a1502 early2015 where the numbers are not visible ... Regards