Garageband w/ Mbox 2 Pro help please. Can we record in stereo? Should we buy a different interface?

Question

Hello all and thanks in advance for trying to help. I'll try to give all the details straight up so I can get direct answers. I appreciate your help.
(By the way this is my first post in the comunity so forgive me if I do something wrong).
The long story short:
- I sing in a 3 person chorus group in Japan.
- We recieved a Digidesign Mbox2 Pro from our manager. (She was told by an engineer in our production agency that we should be able to record easily with it)
- We recieved the MBox 2 Pro itself ONLY. No cords, no software, just the actual interfact itself.
- We bought: 1 Dynamic mic, 1 mic stand, 2 headphone adapter jacks, Stereo speakers, & 1 firewire cord to connect the Mbox2 to the Macbook.
- We could not find an AC power adapter of the right size, so we have no power adapter. The only power going through the Mbox is power coming from the Mac itself.
- We do not have an instruction manual or anything, therefor we don't have the product number or whatever we need to register the interface.
- We can't register, so we can not call the Avid company help center.
- We don't own Pro Tool software. We are using Garageband.
- We downloaded drivers for the Mbox2 online.
I think that covers it all.
Now, we finally have everything connected and the Mbox2 is working with Garageband. We can record but now the real problem is that when we playback what we've recorded through our speakers the vocal tracks only play through the LEFT speaker. The audio track and echo effect from the vocal tracks play from both speakers, but the actual recordings of our voices only playback through the left speakers.
What do we do now?
Is there something we can do to make it so that we are able to record in Stereo?
Should we look into starting from scratch and buying our own audio interface system? If so do you have any reccommendations?
Other points of interest (that may help):
- None of us play instruments so we won't be connecting a guitar to the interface or anything.
-We each have a Macbook laptop computer that we use. The OS's are as follows:  OS X 10.6.8, OS X 10.5.8, & OS X 10.5.8
- The OS X 10.6.8 Macbook won't connect with the Mbox2 Pro.
- Mic specs: SHURE SM58 Dynamic Legendary Vocal Microphone
We are desperate need of help. Anything at all would be appreciated.
Thank you for your time.

Answer 1

Thank you for your time and advice.
When I set the Input Source to Mono there is no sound coming from the microphone into Garageband.
There are 6 mono options: Mono 1 (Didgidesign MBox2 Pro) - Mono 6 (Digidesign MBox2 Pro). And 3 stereo Options: Stereo 1/2, Stereo 3/4, & Stereo 5/6.
The only one that produces sound from the microphone is Stereo 1/2. when I choose the other options no sound appears when I press record.
(The Mic is plugged into Input 1 if that helps at all)