I've bought the above an 8 port switch. I've got 1200av powerline adapters and want to make use of their speed internally, so I've got 1 cable from the sky router to the switch then all my other devices are connected to the switch. I cannot get an internet connection for any device. not can my devices see each other. I've changed the cable between the sky router and switch TNA. Was working fine with just the sky router, am I doing something wrong or is the switch faulty? Link lights are on and flash occasionally.