I have experienced my unit not wanting to come on, when I have a jumper battery's alligator clips attached to the power cable wires (when playing with the unit in the apartment). A little wiggling of the clips, or unhooking & then reattaching the clips usually works. No such problem when unit is connected when on the boat.
I'd check & make sure I was getting power to the head unit ... check for any corrosion or dirt/film on the connections ... push the "on" button one time quickly, & don't hold it down ... especially check where the power cord connects to the battery. Clean those connections, even if you have to sandpaper them clean & shiny.
If nothing works ... seeing as how it's less than 1yr old, it should still be under warranty. The unit is discontinued, but I'd check with Lowrance & see if you could get retail or pro-rated credit towards another unit (or your $$ back).
... cp :kewl