I just hate it when you’re fixing one thing and something else breaks. I installed all three security apps on all three computers, and suddenly, on my wife’s computer, I lost the connection from my Ethernet switch. Got the little icon with the two computers and the red X over top.
So, I go through the usual troubleshooting steps - I swap ports on the switch - No change, I pull the Ethernet cable from her computer and connect it to my MacBook, connection good.
So, the 100 ft cable and the switch are both good.
Windows tells me the Ethernet port on the mobo is good, but no green light, no connection. It says the cable isn’t hooked up.
I disabled the Online Armour firewall. No change. Checked to make sure the Windows firewall hadn’t activated itself - it hadn’t.
So, I need to buy a NIC, I guess. Bummers.
BTW, the signal flow is: DSL modem > Apple Airport Extreme Base Station > D-Link 8-port gigabit Ethernet switch > computers
If the activity lights on the NIC are on, then you probably have a software configuration issue. Maybe a piece of software you installed futzed some DLLs or the NIC driver.
You might not need to buy a new NIC.
replace your cable
Just had the same thing happen to me two weeks ago. All of a sudden no connection through my LAN on the Motherboard. Luckily I had a spare LAN card and threw it in and off we go.
It sure sounds like the MB LAN is gone. What brand of MB do you have?