Help With Q90T And 4K 120HZ Display From PC (RTC 3090)

[userZpyHQlTfRx]

I am scratching my head big time.

I have Windows 10, a 3090, and a Q90T.

But no matter how I toy with the settings, when I enable 120hz 4k I get vertical lines on the top quarter of the screen, and the rest is black.

HDMI cable is rated 48 GB/s, in port 4...all hardware connected as it should be.

I have tried with HDR on, off, game mode on, off, VRR on and off.

I bought this TV specifically to run 4k 120hz, and I'd hoping to find some help with settings to get it working.  

Thanks.