Chosen Solution
Suddenly my brand new Macbook Air turn off with a crack and has a burnt circuit smell, if anyone knows how to fix it please let me know! Help appreciated :) (Computer was fully charged)
Don’t touch it or try to repair it!! Take it as fast as you can to Apple AND GET A WARRANTY REPAIR. THEN CONSIDER GETTING AN ADDITIONAL TWO YEARS OF COVERAGE WITH APPLE CARE.
Sounds like something decided to go up in smoke. I would go with mayer’s answer, as you do not want to cause more damage than what has already been done.