Thanks for getting back to me. I have since found the problem, it was the NIC drivers/BIOS version. Updated them both and the cable is working. I have now discovered the extender is not relaying WiFi...

Model : Hardware Version : Firmware Version : ISP : Product: TL-WPA7510 KIT V1 Original firmware only available. I purchased a TL-WPA7510 kit yesterday and have been having trouble configuring it....