Macbook Pro Late 2013 Yosemite Start Up problem
I am running the latest OS X on my macbook pro retina. When booting up the laptop I get this error message. (pls see attached image)
I ran disk utility and Apple Hardware test. Both checked out fine.
I need to back some files up onto a usb flash drive first. How can I do that as well as fixing the problem?
MacBook Pro (Retina, 13-inch, Late 2013), OS X Mavericks (10.9.1)