no does nothing, engine not turning over just silence, sometimes it will fire up straight away perfect sometimes it will not fire at all others ul turn the key fully silence for around 4-5sec then will turn over and fire up straight away

he there this is my 1st post so plz pls help im stuck, i have a freelander T plate 2.0D, the problem im having is, i put the key in my ignition turn once all lights light up, glow plug lights then goes off, turn again to start the engine and nothing? it wont turn over not a thing, i can hear a...