Audio MIDI Setup ?

[Klaus]

I tested 2 Platform M on a Mac Mini 4,1 / 10.8.5 and AMS sees the 2 units just fine.
Then I tried on a Mac Mini 2,1 / 10.8.5 ( upgraded from a Mac Mini 1,1 with
MacPostFactor ) and here the same AMS version doesn't see 2 units, but system profiler sees them...
Does anybody have an idea what the cause could be ?

Also the Mac Mini 2,1 and OS 10.7.5, AMS doesn't see the 2 units, but system profiler does...and with the Mac Mini 4.1 and OS 10.7.4, AMS doesn't see 2 units either
USB ?
?
Thanks
Klaus