Well, finally I come here. after a lot of problems, I installed elementary OS Freya with my live USB erasing ALL my macbook pro disk but it was not a solution. Now, I turn on my mac and nothing happens... still in white and after a question mark and thats all. I enter using the live USB with the Try elementary OS option and I see the partitions with Freya but I don't know why WHY! it doesn't start with elementary OS T_T.
Pd. I would answer all your question, send information and follow your indications because I thing that there is the best place so solve my problem. Thanks!
Update I've uploaded a video in order to illustrate the problem. Video