No midi input since installing an application

Question

Hello,
A friend of mine asked me to check his computer. While we were at it, we tried to make "Kontakt" to work with Logic Pro (Kontakt installs plugins which should be compatible with Logic Pro). Well, we couldn't make it working and finally gave up with this (also, I don't know Logic Pro nor Kontakt, so I couldn't give much help either).
But there's something worse: since then, he can't play on his keyboard (piano) anymore. Seems like the MIDI system has been broken somehow. Restarting the computer didn't solve the problem (I thought it could be Kontakt that might have temporarily taken the control of the MIDI system). Logic Pro shows "No In" and "No out" (since I never used Logic Pro, I don't know what should be written instead).
We tried restarting every involved device, swapping cables (e.g midi in and midi out) and checked various things, but everything else seems "normal".
He uses an interface (of brand M-Audio) to which is plugged the keyboard, a microphone and the USB out. The interface is still recognized by the Mac (both in System Profiler and in Audio and Midi setup) and the microphone works (he says the signal of the microphone actually passes thru the computer).
We also tried reinstalling the interface driver.
Apparently, the "midi out" is working: when Logic Pro tells to play a note, the keyboard reproduces it (my friend said that instrument was not part of Logic Pro when we heard it).
I'm at a loss at what we should do or check now, and that MIDI stuff is beyond me. Any help welcome!

Answer 1

Jazzmaniac wrote:
Too bad. If you were in the north east I'd say let's try to meet and fix this.
Good luck with it in any case,
Thanks, that's very kind of you.
The problem seems over now... In the meantime, my friend called me by phone: his audio interface wasn't recognized any longer (not just the midi component, but also the sound in, etc.).
I told him to look at "System Profiler", under "USB", and he said the interface wasn't listed there. All was plugged correctly, he guessed.
We tried another USB cable and another USB port (the other one in front of his Mac Pro) with no avail. I thought the interface was slowly gone bad. I told him to try with a rear USB port and this time the interface was recognized again, WITH the MIDI input!
It's the front ports that have failed, problem solved!
Thanks to you, Jazzmaniac and Eriksimon, who gave your help!
(I don't know where to mark my topic as resolved, thought)