Actually I've been around for years. I've just been inactive due to a move and was too lazy to try and find my old account info
The forum had a major reset in 2017 (April, I think), and your old login info won't work if you signed up before then. You could have reclaimed your old username with a new account though.
An interesting problem similar to the one I am experiencing. So I will watch and learn.
Yes, it is similar... but I have struck out with yours, it seems, and my bag of tricks is running very low now for Bill too.
Bill's descriptions and testing have all shown just as he said... it looks like it should all be working, but it isn't. The adapter is "up" and you can ping the localhost okay, so it seems it is functioning... but it is not getting an IP address from the router (which is DHCP). The cable is good, has been exchanged, and shows a link light (at the router end too, right?).
So, all signs (to me) are pointing to the router now... yet it worked with Windows recently. There are few, if any, settings in a router that I know of that would be OS-specific. So if Windows works, then Linux should work too. This should be very easy with DHCP. But one or the other, the adapter or the router, is fooling us.
Back to the WAG department...
1. If you haven't already, by all means reboot the router.
2. If you haven't already, switch your ethernet cable to a different port on the router. Be sure the link light is on at the router too.
3. If you haven't already, try both Fedora and your LiveDVD. Even download and try another LiveDVD or two, or three.
4. If you haven't already, log into your router and carefully examine all of your settings to see if you can spot anything there that might explain this. For example, I use to set my router to only allow a very small number of incoming connections on my LAN, just enough to cover my devices. If yours were similarly limited, that could explain why it won't issue an IP. Not a likely scenario, I know, but we're back at WAG's now anyway.
5. While you're in your router configuration... look at the IP range it's using for DHCP, where it starts and how many it allows. I'm not sure if it will work, but you may can assign a static IP address to your adapter to match your LAN config, and perhaps force the router to recognize it. Again, not sure about this.... I've never tried it. Worst case might be to manually configure everything on your LAN and not use DHCP... which could be a whole lot of trouble with people using so many devices these days.
Maybe some of the smarter people will jump in here with better ideas too!
Cheers