[Lily Swan]

Hi, I just got a Macbook Pro and it shuts down every time I plug in the firewire for my Mbox Pro. I'm not sure what generation Mbox I have--purchased new in 2016--High Resolution 8x8. It has firewire 400 and my Macbook has firewire 800. I bought an adaptor cable with 400 on one end and 800 on the other. Every time I plug it in, my Macbook shuts down.

My Macbook is a mid 2012 Mojave with 2.3 Ghz i7 and 16 GB of memory and 2TB SSD.
I am running Protools 12.3

I would appreciate any help.

Thanks!
Lily