I had two help calls today regarding lost Internet connectivity. There are lots of troubleshooting steps that can be taken but I've found that if the loss is sudden and there haven't been any changes on the user side that it can usually be solved by ''refreshing'' the IP with the provider. If rebooting the PC doesn't solve the problem, another quick fix is to disconnect power to the modem, wait for 60 seconds and then re-connect. If you have a router between your modem and PC(s) you may need to log into the web management of the router to ''release and renew'' your IP address.