Hi everyone. I just recently got one of the new 2016 13" MacbookPros NTB. I was trying to boot up an external USB 3 drive with Sierra on it and it does not work. I am getting a symbol on my screen for a few seconds and then it just shuts down. I am attaching a pic of the screen. Apologies that it is not that clear. This is happening when I try to boot from one of the USB C ports directly and via USB A with the Apple multi port adapter. I never had this problem when I booted this drive from my MacBook Air. Has anyone seen this before and is this normal?