THE LIGHT ON THE FRONT WILL NOT COME ON AFTER DOWN LOADING I THINK 6.1 THE UNIT IS 4 DAYS OLD

just bought apple tv 5 days ago did have it working ok but it started a down load i think 6.1 but when that finished the white light went out now the remote will not bring it back on tried taken the power off etc but still no light it appears the down load caused the problem