When turning on my 2011 MacBook Air I get the folder with ?. So i used the option key while restarting. It goes into internet recovery mode. It finds my network and starts to download. takes about 25-30 minutes then after download the apple logo comes up with the spinning wheel under it but after aboput 15 seconds or so it shuts down on it own. I press power button to turn back on and i am back to the folder with ? screen. I have tried the internet recovery three times and get the same results everytime.