Question marks in OS X and what to do about them
In several situations when running OS X you may encounter question marks. Of course there should definitely be one somewhere on your keyboard (likely next to the right Shift key), but there are other instances where question marks may appear in the system where there shouldn't be one. Usually these indicate an instance in which the system cannot locate a specified file, location, or other resource and in its confusion shows a question mark.
Start-up
When OS X boots, it will by default use the boot volume that is set in the PRAM, but if that setting is not … Read more