Unable to locate M- Audio hardware affecting the access to Pro Tools program

My M- Audio USB microphone is not detected for the Pro Tools M- Powered Essential program, so when I tried to open the program, it said, "Unable to locate M- Audio hardware. Make sure your hardware is connected and turned on," but I can see and use the microphone in GarageBand or the general setting for sound on my MBP and the blue light for the mic comes on once I plug it in my Macbook Pro, so what's the problem, and how do I resolve that. If you know how, please give me a reply email at wangnga@hawaii.edu

Thank you.
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