My macbook air suddently not opened... After i tryed some days, it runs again. İ tried all the resets or what ever i read on internet it didnt start. But it run in a day suddenly and normally. Than after some time it did the same thing again, again and now again... When it doesnt working the lcd light on charcing cable never turns green except i stop pressing the power, shift,control and option buttons( reset ) . also i tried pressing long to power button but its not working already.. No signal on monitor or keyboard...are there any one has any idea whats happening to my mac....