I'm not a protools user but my friend uses pro tools with an Mbox2 and he upgraded to leopard not knowing it was going to mess up pro tools. so he asked me to downgrade him to tiger and pro tools launches again and everything but the Mbox doesnt want to turn on. so i guess the MIDI is all messed up on his computer. in system preferences it say "Mbox2 not connected" when it was. i had him go into Audio MIDI Setup and the Mbox2 showed up but i'm unfamiliar with all this so i didn't know what to do. any ideas on what to do? please help!