MIDI 2x2 audio interface issues.

Okay, so, I have an M-audio box set right. It’s my first DAW set, still learning how to use it. Yesterday the audio interface was working just fine but today no audio comes through my speakers. I’m not completely certain that it is the audio interface but I’m not sure what else it could be. Sound does come through the speakers but it is so soft you can hardly hear it. Anyone have similar issues and knows what I can do?