Display no signal when 1440P+ full screen gaming

[Wouter_U]

Hi,

 

I bought a new pc a few days ago but am having trouble with full screen gaming. Whenever I try a demanding game, or 3dmark for example, and run it higher than 1080p full screen at 120Hz, the TV will say that there is no signal all of the sudden. If I press Alt-Tab or press the windows key etc, the screen will come back. But the signal is lost again when I try to go back to the game. Also with less demanding titles it seems it does work even with 4k 120Hz

I can run everything at 1080p full screen, but I bought a 4k 120hz display for a reason.

In windowed mode it works just fine, but a lot of applications default to full screen, So I do want this fixed.

One thing that I do still need to upgrade is my HDMI cable. It's an older one and not hdmi 2.1. But this was never a problem before with my old pc, so I'm not sure if this could really be the issue. Also I've noticed that the game does keep running while the screen loses signal. i can still click on things and when alt-tabbed I can hear the music and sounds of the game and when hovering on it on the taskbar I can see the screen preview.

 

Things I've tried:

Updating Drivers/reïnstalling drivers

Clean Windows install

Checked if cable is connected to correct HDMI 2.1 ports

Tried with G-sync on and off

disabling variable refresh rate on TV

Tried 4k on lower Hz

 

My system specs:

CPU: AMD 7800X3D

GPU: Nvidia RTX 4080 Super

Motherboard: Asrock A620I

RAM: 32Gb Corsair Vengeance at 6000hz

PSU: Cooler Master V SFX Gold ATX 3.0 850W

 

TV:

TCL 55C745

 

i hope someone can help me because if a game defaults to full screen I am just unable to play it.

 

[Wouter_U]

I really hope someone can help me because I don't know what to try anymore

[Kid.Lazer]

What is your default desktop resolution?

[Wouter_U]

On 4/24/2024 at 6:49 PM, Kid.Lazer said:

What is your default desktop resolution?

My tv resolution can be 4K but right now i'm satisfied with 1440p because of the cable which can't handle 4K. So for all non gaming things I have my pc at 1440p. But when I want to game I have to switch to 1080P.

[Kid.Lazer]

And what refresh rate is that? It would make no sense at all that your desktop can display a certain resolution and refresh rate, then suddenly games can't.

 

Also, cables very much do matter. Whether or not it worked with a different system, you should get a cable that is rated for the HDMI version you're trying to saturate.

[Wouter_U]

I run at 120Hz. But like you said, if it works windowed games why wouldn't it work in full screen games?

A HDMI 2.1 cable is already on the way, but it just really confuses me that it did work with my previous computer at 1440p 120Hz, and that with some lower end games it does seem to work without problems.

[Wouter_U]

It seems that the new cable has solved it. Still I do not understand why it suddenly stopped working when I got my new pc, as it had worked before with my old one. Also why it only decided to not work with full screen games and not with full screen 4k video for example. But whatever the reason, I can finally enjoy my setup.

Thanks for the support