Oppo tech support needed

I have Comcast internet coming in, the modem is one I own, an Arris CM820. If I directly connect a device via hardwire, I have internet. If I connect either of my wireless routers, no signal comes out the other side. Either wirelessly or through Ethernet cables. The routers are a TP Link AC1750, and a Netgear N150. I tried replacing the patch cable going between the modem and the router.

I am completely at a loss. HALP!!!

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