2003 Nissan 350Z won't start

Electrical problem
2003 Nissan 350Z 4 cyl Front Wheel Drive 100697 miles

These last couple of days when I go to start the car and it won't start the radio, lights everything works but the ignition won't turn over doesn't even click. So if I push the clutch all the way down it still won't start. Someone told me that I was not pushing down hard enough. But I am. So can you tell me what might be wrong