Repairs TB340 WON'T START AND IS < 1 YR OLD!!!!

EVERY SINCE I FIRST PURCHASED THE MOWER IT WAS DIFFICULT TO START!!!! IT SAT DURING THE WINTER AND I PUT FRESH GAS IN IT WITH A FUEL STABILIZER PLUS CHECKED THE OIL BUT IT WON'T START:frown:
TROY BILT 12AKC32N766 190cc gas 21 in. triaction 3-in-1 self-propelled mower size 39.0 x 24.2 x 17.9

3-year warranty. Take it in for repair.