Help with Denon S510BT 4K

ukfigs

Novice Member
Trying to use a Roku Stick 4K plugged into the Denon S510BT receiver, I get a picture but it is basically yellow and purple with bands across it (almost like it is not displaying the full color table), tried all 3 of the 4k HDCP 2.2 inputs, replaced the hdmi cable to the TCL Roku TV with high speed 8K cable, tried the different HDMI inputs on the TV but no change. The stick works fine plugged directly into the TV (using the stick because roku OS update 10.5 has bricked a bunch of functions on the TV). The Blueray player also works fine in the receiver but is only 1080p. Also tried setting fixed resolution on the stick etc. Suspect some kind of sync/handshake or configuration issue but don't know where to start. Not many video setup functions on the Denon to adjust. Appreciate any guidance on how to fix this.
Thanks
 

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