The connection between your access point, router, or cable modem and the Internet is broken?

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Replacing the cable between modem and router is a good recommendation. Assume the access point and router are the same device?

Learn how to access your routers management setup. Figure out where your routers DHCP setup is.

DHCP has two sides. One side is a DHCP client that gets it's IP address from your service provider. The other side is a DHCP server that provides IP addresses for the devices on your network.

You want the client side. On the client side setup you should be able to release and renew the IP address.

When you can't get on the Internet can you get to the router setup? The router is demarcation point between Internet and your network. Even though you can't get to the Internet you should still be able to get to the router. If you can't get to the router - take a long look at your PC.

When in the router if you release the IP address (it goes to 0.0.0.0) and you can't renew it that means your router isn't able to get through the cable modem to the service provider. In this case your problem is the service provider or the modem.

Another way to confirm it's not the router is to connect a PC directly to the modem. If the PC can connect directly w/o router, but the router can't connect when directly connected then maybe your router is the problem.

The key is to understand what's happening with the IP addresses.