04 Legacy h6 don`t start

[mody2220]

hello everyone i  use my car every day today i can open my car from key buton so i open it just by key i put the key in the ignition and radio is on aircon all lights but the car is not starting i change the batery in key still nothing  any ideas ?

[GeoffLeggy]

Car Battery with a little life will run the dash lights but won't turn over.  Check that first then on to immobiliser