A couple of days ago my 2011 13 inch MacBook Air booted to a white screen. I looked up possible fixes including resetting the PRAM and booting to recovery mode or Disk Utility. The problem is no matter which trouble shooting keyboard combinations I try it just boots to a white screen. Does this mean it is the hard drive or could it be the motherboard as well? If I press the cap key on the keyboard when it is powered on it does not light up so I don't know if that would be a hint that it is not the hard drive.