After taking it to Apple, I discovered, with the aid of some very friendly Apple Geniuses, that the hard drive cable somehow ceased functioning and needed to be replaced. That prevented my MacBook Pro from being able to bypass the hard drive upon boot, therefore not allowing it to boot from any other external media.. As a plus, it was a free one-day repair!
+
After taking it to Apple, I discovered, with the aid of some very friendly Apple Geniuses, that the hard drive cable somehow ceased functioning and needed to be replaced. That prevented my MacBook Pro from being able to bypass the hard drive upon boot, therefore not allowing it to boot from any other external media. As a plus, it was a free one-day repair!
After taking it to Apple, I discovered, with the aid of some very friendly Apple Geniuses, that the hard drive cable somehow ceased functioning and needed to be replaced. That prevented my MacBook Pro from being able to bypass the hard drive upon boot, therefore not allowing it to boot from any other external media.. As a plus, it was a free one-day repair!