We have lot of customers come with this problem macbook question mark on the folder this is not a problem that cannot be fixed. There could be several reasons why your macbook getting question mark on the folder depending on the what version of operating system you are using and what kind of macbook you have but there is one answer that applies to all that your macbook ca not find a bootable disk or OS.
The most important step in this situation is to save your data, you can run recovery tool but if you have not backed up your data most probably fresh install will overwrite and you will lose your important information like pictures, music or document folders.
Macbook question mark on folder could be just the OS which somehow crashed or it could be a faulty hard drive. if you experienced same problem on your macbook we at applefix 85/a Victoria street Hamilton can fix with in a day.