Pls help. just bought a mxl 990's mic and have it running through a yamaha model mg10-2 mixer and

Question

just bought a mxl 990's mic and have it running through a yamaha model mg10-2 mixer and cant seem to get sound out of the mxl, however i have an older mic that if plugged in to the same in put works fine...i have this running through my desktop computer with sound forge and acid pro 6.0...my mixer runs through rca speakers