They didn't keep the coop lit but I kept the same diet they where on but no molting is going on@William buff, so you don't know how old the other chickens are, you moved them from another place to yours and you changed their diet?
Moving them and changing their diet will mess with chicken cycles. It can take a couple months for them to start laying again.
Do your older chickens look like they are losing feathers? It is a bit early but the stress may have thrown them into an early molt.
Did the previous owners keep their coop lit at night? That would make a difference too.
I have heard that quite a few times. Several of the people I worked with thought you had to have a rooster to get eggs also. Even my neighbor, who now has chickens, thought she had to have a rooster to get eggs. Another woman who visited our place when we had ducks got an eyeful when a pair decided to mate right in front of her. She didn't know birds "diddled" as she called it. She thought they were like fish and the eggs fertilized after a clutch was laid.Hmmm. Not sure when or where I picked up the idea that without a rooster hens wouldn't do as well. Glad I asked!