Old MBox with new MacBook

[farfield]

I just bought a macbook (2GHz Duel Processor) and wanted to use my older MBox with it. I've installed Pro Tools LE 6.7 but when I plug in the hardware, my computer doesn't read it (that is, I can't see it in my system preferences for sound for the input/output options) and then when I try to open up Pro Tools I get the message: Digidesign hardware is in use by another application (-1133). What in the world does this mean?? And how could it be possible for another application on my computer to be using the hardware when the computer seems to not even be reading the MBox?

Any advice on how to fix this would be greatly appreciated! Thanks.

[DigiTechSupt]

Pro Tools 7.1.1 is required for use with the new Intel Mac machines. You can purchase an upgrade through the Avidstore.