It's still very unclear. Was it working, then suddenly stopped, or didn't work next time you powered up? Realistically, if it won't record, and in your first post suggested it
suddently went down this could mean went down, as in broke completely and it went silent, or it went down in volume?
You are going to have to at least borrow another mic and another cable so you can substitute if you don't have the means to test the cable and the supply voltage. If you can borrow a condenser a straight swap will prove if its the mic. If the swap still produces no volume, then swap the cable. If no luck, then that leaves the interface. If you're sure you've pressed or adjusted nothing physically, then it's very unlikely to have fully, or half died. Does it still let you hear the music from computer out of the headphone socket?
with the mic plugged in, do the meters flicker when you speak? How about plugging in a guitar cable and twanging on that? Does that work? If none of the inputs make anything happen, then look at the computer - Does FL studio detect and show it is using the interface? Does it have some odd windows driver instead of the external device? It happens sometimes. You could always re-install the driver for the m-audio
link here.
Plenty of things to go through systematically, one by one. Eliminate potential problems stage by stage - what's left will be the problem.