Mbox Mini Issues

[notr2d2]

Hey guys,
I found out some things about my Mbox Mini. If I plug the cable from the M-Audio Monitors to the Audio in/optical digital// Audio in port on the Mac mini, there is no high hum. I am able to plug in my Eleven Rack into the Headphone Out & it sounds fine. Is there a way to plug it into the Headphone jack?

I also found out it will work fine (?) the 1st time I open up Pro Tools. But if I quit PT & try to open it up again, the computer will freeze. So I will shut the computer down with the power button. Any thoughts?

Also, PT is not able to record anything. I can hear the guitar which is connected direct in to the Mbox but nothing can be recorded. That might be something with the I/O settings which I'm unsure about. Any thoughts on how to fix this?

I am unsure whether the Mbox Mini is broken...

Thanks,
David