Have you checked the powerlines with another internet connected device, such as a laptop, or smart TV? If these work it will eliminate these and the ethernet cable as a source of issue. If that doesn't work, try changing the cable for another and resetting the powerline plugs.
Anything you test this with, be sure to disable its WiFi temporarily, yes? So you know that the only path to the router is over the Ethernet cables and PLAs, just as it is for the YouView box.
And that reset, it was a ‘touch the On/Standby button for just over 8 seconds’ reset, not just a power cycle?
As a Maintenance Mode reset on a non-connecting box won’t recover without @Stephen’s special sauce….
‘Have nothing in your houses that you do not know to be useful, or believe to be beautiful’ Wm Morris
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Can you get the iPlayer to work and play content, or is it other content from you internet provider that will not play.
If you can provide a bit more detail someone here should be able to help.
Also, what reset have you already tried?
It won’t play content. Its connected via a Powerline Adaptor
If that doesn't work, try changing the cable for another and resetting the powerline plugs.
Anything you test this with, be sure to disable its WiFi temporarily, yes? So you know that the only path to the router is over the Ethernet cables and PLAs, just as it is for the YouView box.
And that reset, it was a ‘touch the On/Standby button for just over 8 seconds’ reset, not just a power cycle?
As a Maintenance Mode reset on a non-connecting box won’t recover without @Stephen’s special sauce….