you may have netgear router stopped working problem, just because of few things,
- Physical Connection problem
- internet Connection problem
- Firmware is outdated.
So these are few reasons, which may stop your netgear to serve the internet. so you need to make sure that your modem is connected from internet port of the router.
once you will connect the modem to the router, i will suggest you to reboot the router and modem and then try to access the internet.
Also, you need to make sure that you are getting internet from your modem. so you need to connect your modem from computer and try to access the internet. if you can't access the internet. i will suggest you to contact to internet service provider and ask them for help.