Limited Connectivity is almost always associated with the loss of locating the
DHCP service on your network.
First question is, What has changed? Did you take a laptop elsewhere, connect
and then later bring it back home and it now fails?
We need a description of all devices from the ISP to your system,
Connection type, modem make/model, router make/model, system connection type
(wired vs wireless {with the make/model of the adaptor} )
If your system is a desktop, have you tried powering off the modem,router,system and restarting each with a one minute pause between each?