i have an elitebook 1040 G4 running windows 10 (64bit), suddenly the left ctrl alt del keys durring the first time the laptop opens do work. in order to log in you have to you the right keys. when you log in the left keys are working.
If you immediately restard the the laptop the left keys are working even in the first log in.
if i open my laptop the next day i must use the right keys. it is really furstrating.