Do you see the bottom on the screen? If on auto gain, go to manual and when gain is increased, more 'noise' or speckles should be seen? Check orientation of the transducer face if transom mounted. Is the battery well charged? Liston for an audible thump with transducer next to the ear. Hold the transducer face parallel to the floor 1 ft. high, it should show 4 ft reading.