Why does my Monitor go black on 120Hz when I press the B button to come out of the dashboard?

So why did I not have this problem with my old monitor? Even on 1080p with both monitors at 120HZ, it’s only the BenQ monitor that is black screening.

I can't tell you thst without being there and looking at them

What i can tell you is that the fade to black is the internal scaler switching gears on every display I've ever seen.

The dashboard runs at a different resolution and it must re-sync.

When I press the guide button the option menu comes up, but when I select exit to dashboard nothing happens. The screen just remains black.

for 120hz you need i think hdmi2.1.

besides connecting the s at 120hz is not going to magically let it run at 120fps, you will be lucky to get 40fps on most games. kills my eyes running so slow.

HDMI 2.1 is only needed if you plan to game at 4K for 120hz , on a 4K 144hz monitor, However there's no gaming monitors available at the moment, that yet has HDMI 2.1, the first HDMI 2.1 monitors that are likely to come in are around the same time as the
Series X (Q4) launch or early 2021 (Q1),

1080p and some 1440p monitors can do 120hz over HDMI 1.4 if it's supported, but best ideally is HDMI 2.0 for 1440p for 120hz,

HDMI 2.0 can do 1080p / 1440p at 120hz and 4K at 60hz,

HDMI 2.1 can do 1080p / 1440p / 4K at 120hz.

For the Xbox Series X, it best to get a 4K TV or monitor that supports 120hz and has HDMI 2.1, to get the full potential out of the Series X.