I recently purchased and installed an AMD Radeon HD6570, as well as a new 500-watt power supply. Ever since installation, my computer has had troublesome times connecting via ethernet. It should be noted that I switched to AMD from an Nvidia GPU, which is the stock card for my system. At first, I received the error message "Windows was unable to automatically detect this networks proxy settings". IPv4 was receiving an internet connection, but IPv6 wasn't. I thought it might have been an ISP issue with the university I attend, but now the LAN adapter is completely unable to recognize a plugged in ethernet cable. It's not a problem with the cable or ISP, because other computers are able to connect using the same port and cable. Even the little green light that flashes around the ethernet port on the back of my computer has stopped flashing. I downloaded the most updated driver for my network controller (Intel 82562V-2) and used some of the newer features to test my LAN device out. The hardware and cable tests returned a success, but my connection failed. There was also another device called "PCI Simple Communications Controller" without any installed driver to run it. But most online results said this was a minor issue. EDIT: The missing "PCI Simple Communications Controller" turned out to be a Systems device called "Intel Management Engine Interface". I found the correct driver for the device by looking up its vendor/device codes on pciexpress.com, then manually installed the driver. Doesn't seem to help out the internet however. Maybe its one of many firmware problems involved with the ethernet controller? This is all extremely confusing to me: How can the LAN device pass all of its functionality tests, recognize when there is and isn't an ethernet plugged in, but still remain disconnected and completely non-responsive? My guess is my computer has a major issue with the university's local network, or that there's an extremely subtle cable/port malfunction.