I recently purchased an additional USB 3.0 Hub and another external HD so I could boot from an old back up off the ext drive. The only thing on the external drive is my Mavericks system. My Acer external monitor/display doesn't work when I do this. It should work as if booting from internal HD as usual, correct? If not, I'm going to return the new hub and HD. I was looking for easier work around to a problem, not creating another! Thanks in advance.