KD-65XH9005 4k 120 PC Input problem

[Antimonum]

I want to connect my windows PC with 4k 120Hz capable Video Card (RTX 3060 T)) to my new XH90 via a HDMI 2.1 certified cable. When I switch HDMI input in my TV to HDMI 4 to enhanced input type - the signal disappears.

In my PC windows does not recognize my TV as 120 Hz capable at 4k resolution. How can I make my PC output 4k 120 Hz function on my TV? The TV did get the latest firmware update yesterday after I bought it.

[HannahEd01]

The latest v6.0414 definitely supports 120hz 4K, have you tested another device? I would double-check that this card supports actual 120hz at 4K too.

[Antimonum]

I already wrote I do not have any other device capable of 4k 120Hz. My
Nvidia RTX 3060 TI OC Card is a new last Generation Ampere RTX Card and all
NVIDIA last generation RTX Carts support HDMI 2.1 4K 120 HZ (the reason I
bought It). It has the latest NVIDIA Drivers for Windows.

If you don`t believe It Here is My Card Description:
citing:
In addition to those numbers, the RTX 30 series GPUs feature HDMI 2.1 that
enables support for 4K@120Hz.
It is referenced from here:

https://thepcenthusiast.com/zotac-geforce-rtx-3060-ti-twin-edge-oc-review/

[HannahEd01]

What about the cables? If you're using a high speed 4K compatible ones then try a factory reset on the TV then: https://helpguide.sony.net/tv/haep2/v1/en/08-01_03.html?hl=factory.

[Antimonum]

I bought a second high end 2.1 cable because of this and at the end did a
factory reset and nothing helped.