thanks for your reply.
Yep, the mics need Phantom and I tried it. The thing is that when my headphones are plugged into the m-audio box, I can see and hear a signal. However, Logic doesn't receive anything. My guess is that something's wrong with Logic...I'm really new at this so maybe I'm missing something really simple.
no worries, these are all good suggestions to check out.
Actually, I did all of this already, but the problem was somewhere else....
I finally found what it was. The m-audio has a software that has a board control and the "software returns" signal was off.
Also, a good "restart" of my computer made things a bit easier.
Thanks for your help!