My interface decided to stop connecting to firewire yesterday. It's not a problem with my mac or pc it's the unit itself. It powers up just won't connect, I was wondering if anyone would know what component failure would cause this? I bought it used so no warranties and I really don't want to pay what they charge to repair it. Looking if there is a DIY way. I know it's a long shot but if anyone has any knowledge about this I'd be very grateful. Thanks