Can an administrator please help me?

I have a two pack Deco x55 Version 1.26 and it worked beautifully but then an electrical outage caused the Deco's to lose ethernet connectivity.  The satellite Deco crashed earlier and is in a start-up look and will be replaced.  However the main Deco ethernet ports stopped connecting to my computer and Apple TV.  That is the problem I would like addressed in this thread.

1.  I have changed ethernet cables.  No success.

2.  I have rebooted the modem (used in IP passthrough), Deco router and devices and still no success.

3.  The ethernet ports still work on the main Deco as I have used all three for modem connection and we are still getting internet.  However, when I plug my computer into the Deco ethernet ports, it does not sense LAN connection and still only connects to WIFI.  I have disabled WIFI on these devices but still no success.  The Deco will not output through the ethernet ports.

I have been reading these threads for over a week and this seems to be a LAN sensing problem?  I have also tried reseting the Deco but again - no success.  I really do want the ethernet ports to work because that was the main reason for buying this pack as I like wired connection when possible and wireless only for smartphones and internet of things devies.  By the way - the wireless works flawlessly.

Much thanks,

BVP