I'm not sure if the Ethernet port on the motherboard is faulty or the BIOS because whenever I plug in the cable the signal on my pc goes yellow(unidentified) and red(not connected) in interval of every 5 seconds. I've tried using a PCIe Ethernet adapter but it does not work either. Internet works sometimes but I have to get lucky and plug the cable in and out for like a hundred times. The lights on the motherboard blink continuously. I think something is wrong with the BIOS/Chipset itself. Please help.