No Start

[chromedome195]

OK....I need a little advice from our experienced and helpful group.

I go to start the GZ250 today. And it will not make a sound. No cranking, no lights, no nothing. The battery was replaced just recently when the bike was inspected. The last 3 days the bike has been started and run with no issues.
I understand there are sensors that complete the circuit at the clutch lever, the key, the kick stand and the kill switch.
Question 1--is it just the key lock assembly that would cause the everything to be dead including the headlight? Or can any of the other sensors also be responsible for that symptom also?
Question 2--is there anything else I should consider as the culprit?

thanks