Suddenly on my MacBook Air 11,6 A1370 2011 model the keyboard, track pad and right USB slot stopped working. Tried resetting NVRAM / PRAM and SMC no effect. The keyboard just do not work during the boot. The only button that works is power on button. The USB port on the left is also not working. On another side USB port works just fine and notebook could be operated with external mouse and keyboard. Does anybody has an idea, what it could be and how to fix?