The Ethernet link is not responding.
The Ethernet link is not responding.
I would try booting another OS. Perhaps Linux off a thumb drive. If Internet connectivity returns we'll know Windows is doing something dumb. Going forward checking for DHCP may be worth it (though usually the red X means it doesn't detect a active cable at all). If no internet connectivity appears and the Interface isn't disabled in the BIOS there's the possibility you have a dead NIC.
When I get back, I might disable DHCP and check for a red cross. That would be helpful. Or if you're interested, it could be useful too. I'm pretty certain I saw a red cross earlier.
I need to confirm this. I just realized the yellow triangle usually appears when you have an IP address, yet Windows still doesn’t indicate internet access. This would be what I expect if the connection is active but not properly reported.
The DHCP isn't working, but your Ethernet cable and router seem fine. Which Linux distribution should you switch to?