Tank you for your answer. the first machine with I7 processor they sent me a dell guy and they changed my motherboard, keyboard. They made my Wifi work but no my Bluetooth after updated the drivers. then Dell said that was the I7 processor problem and send me a I5 with the same problems (no wifi, Bluetooth), after update all drivers they said it was a problems between Intel processor, win 10, not hardware....I have 2 "new machines", 1 I7 and 1 I5 , still have problems with sleep mode, Bluetooth and display driver and Dell says they don't have any solution .........it's unbelievable!!!!!!!