First suspect: phantom power off (green light on?). Check the little switch right next to the XLR. Typical setup (at least the way I use it) is phantom on for mic setting, off for line setting.
Second suspect: cable or contact. Wiggle it around a bit, pull / push, see if things change. Any "sound" at all from the cable when listening through headphones and subjecting it to mild force is a clear suspect.
Third suspect: 722, but far down the list.
Gunnar