Blue Microphone [XLR-USB] Help?

So I got a Blue (Microphone Company) Spark. It's a nice work of art, I admit! But for some reason, it isn't working on my Mac (OSX), and what's happening is that it connects but it's not loud enough. Here are the details..

The Adapter (according to details on the side) :

XLR to Mini USB MIC.Adapter

Cat.No.33-331

Made In China

03A10

Blue Spark Microphone (according to the booklet included in the box) :

Tranducer: Condenser

Polar Pattern: Cardioid

Frequency Response: 20Hz - 20kHz

Sensitivity: 28 mV/Pa

Output Impedance: 50 Ohms

Rated Load Impedance: Not less than 1k Ohm

Maximum SPL: 128 dB

S/N Ratio: 84 dB

Noise Level: 10 dB [A weighted]

Power Requirment: +48V DC Phantom Power

Weight:1.25 lbs.

Dimensions: Length - 7.76 in; Diameter - 1.77 in.

Blue Spark Microphone Barcode (according to the box) :

X0008Z7UXD

Blue Microphones Spark Condenser Microphone, Cardioid New

Please help.. I'm doing videogame commentaries, and this microphone costed me $164.99. Is there something wrong with the microphone? Do I have to buy a new one? Or what about the converter from XLR to USB? How do I fix it?

Oh, and they're both reletivaly new... I got the microphone maybe at the end of November 2012... The converter... Maybe the second week of December 2012.. No way to know for sure... I tried setting it up once before but it (like now) didn't work and I had to quit. Now I'm seeking help, andyways back to the didn't work part... I let it sitting out since then... maybe like a month? I figured I could get it to work later. For now I can use the iMac microphone, but it doesn't get direct sound.. That's the reason I want the microphone to work. I want a clearer, closer sound. Thefore I don't have to speak up as much. Anyways, I'd appreciate the help. Thanks!

-Manny