L100 won't start, not even with a jump. I turn the key and get no sound. battery is older but ok. Is it my starter. Thanks Steve

If you hear a click, you key switch should be good, but either your solenoid is bad, or starter... or 1 or more of the safety switches (Or the wiring to them) has probably failed. Start by checking connections to the plugs connections to them. If you do not get it going with that, call lawn & Garden service and the can have a tech diagnose it

Starter or starter solenoid