Attempted to upgrade to Mountain Lion from Lion. When it rebooted a blank screen appeared with a blinking folder containing a question mark. I've tried all the different key combinations I could find and the only one that worked is holding down the option key. It brings up the EFI password box. Is there any hope for me? I don't know the password nor do I have my start up disc cuz I'm currently working out of town. It's a mid '09 13" mackbook pro. The all aluminum one. Any help would be greatly appreciated. Thank you!!