Don't give up on new seed. It takes time--warmth and moisture. The soil temperature here hit 60 today; that is under turf in a semi-shady spot, at a depth of about 2 inches. Air temp warmest of the year at 77. I have tiny signs of sprouts in my outdoor containers planted during each month of the winter, but I am waiting a few days to be sure, as they are mostly less than 1/4 inch tall.