monitor loosing signal

[Quantum]

whenever I play fullscreen on anything my monitor after a minute looses signal and all audio is lost. This began happening after I moved my computer back after using a 4k tv. I thought it was the drivers so I gave them an update but the issue is still persisting. I'm not too sure what to do as my system was running perfectly on the TV prior to moving it back. I thought it was strange i can run games in a window on my main monitor at 1080p fine, but if i bumped it up to 1440p I lost signal immediately. Any ideas on what i should do? The computer stays on but I have to reset it to use my system...

MONITOR: alienware aw3423dwf
CPU: Ryzen 7 5800x3D with Kraken Z63
Motherboard: ROG Crosshair VIII Hero X570
RAM: Two 8 Gb Corsair Vengence RGB pro (16Gb)
GPU: RTX 3080 FE
Storage: 500Gb Samsung 970 EVO Plus and 1Tb Samsung 980 Pro NVME M.2
PSU:RM1000X

[mtono]

maybe try differnet monitor for 4k action or, what i dont think, update your bios of the mobo. also can be software error --> reinstall windows. er what? i cant say, but i would try these possible fixes

[Pocahawtness]

Are you exceeding the bandwidth of your cable?

Try switching HDR off or reducing the refresh rate.

[PopinFRESH]

Are you using an HDMI or DisplayPort cable? Swap your cable with a DisplayPort 1.4a or later cable.

Make sure you are using a compatible refresh rate for your monitor at that resolution.

That monitor isn’t “1440p”, it is an ultrawide 3440x1440. HDMI is only supported up to 100Hz on it, DisplayPort supports up to 165Hz on it.

If it’s working fine and loses signal right when you launch a full screen game then your game is using an out of spec signal; either resolution or refresh rate is too low or too high. Full screen apps/games are taking over control of the display from windows. Try launching the game in borderless window mode which leaves the refresh rate and resolution at the desktop settings in windows control.

Or as noted above your exceeding the bandwidth of the cable you’re using.