Were you in the water when it wouldn't show up? If you did a reset and it didn't make it work while it was in the water, you might have a problem. If you have a friend that has a 1197, 1198, or 1199, plug it in and see it it works on their boat. If so, you have a transducer problem.
Capt. Craig Copeland
2013 Nautic Star 2110 Shallow Bay Boat
Humminbird HELIX 12 CHIRP MEGA SI GPS G2N
Nautic Star Boats Pro Staff (nauticstarboats.com)
Redneck Fish'n Jigs Pro Staff (redneckfishn.com)