Bought this router about 3 months ago. Installed it "Plug & Play" and have not changed anything, Has been working perfectly until recently. When I changed addresses and the internet provider moved my service they gave me a new modem as the old one was 5 years old. Now the router is not working. Any suggestions?

Turn it off and on again.

Have tried that also rebooted it, also tried starting the router after the modem and the modem after the router.

Have you tried turning it vertically instead of horizontally? It helps the electrons go round the corners.

Or perhaps you need to sacrifice a goat first.

The title of this section of the forum is Beginner Basics, not poor humor!
If you do not know the answer to a simple question you should not respond, as it is more likely someone with knowledge will answer if there are no other answers.

Any suggestions?

For start, post some actual useful info. What exactly doesn't work, what's your configuration, things like that.

If you do not know the answer to a simple question you should not respond, as it is more likely someone with knowledge will answer if there are no other answers.

The point is that there IS NO ANSWER to your question. What would you expect anyone to say? Nobody can say anything apart from the pointless rubbish I posted (should I have included <sarcasm> tags with the first answer?), because YOU don't give any information to allow them to do so. Why do you think you haven't got any replies?

You might want to check the dhcp client on your Wan (usually eth1) interface. Check if you have a bound ip from the isp. If not, it might be best to ask them to look into why Its not giving you an ip, since you don't seem to get too into the weeds with the setup.