So I went to my MacBook the other day and the screen shows nothing but a folder with a question mark flashing. It won't reconize my hard drive. I can still hear it spin up and running so is this still a hard drive issue? I have tried all the recovery and Cmd Opt P start-ups and have still gotten nothing.
You must try to use low level format, this software run on windows... After the format, it ask choose MBR or GUID... You must select GUID, and install again OS X.