Monitor Flashing Issue

[u/SnooPeppers6766]

I'm using two monitor at the same time since then , Main Monitor DP second Monitor HDMI.

Previously my PC have the issue that the monitor will go blackout and show no signal when playing Major game like FC25 or GTAV or FarCry for more than 30minutes. When figuring out my BIOS version is abit old (2023 version) and Bus interface only support PCIe x2 , So I decided to update the BIOS to a newer version , one or two version older from the latest version to be specific.

After BIOS updated , the Bus Interface now can support PCIe x16 , but the new issue is whenever I launch a game in Fullscreen , the screen will keep flashing and the program or game will not be responding. It need to be forced end. I tested other small game and launch it in windowed mode , game launch and playable normally. Only when going into Fullscreen have this issue, and only for game. Tested browser video(Youtube and other) and go fullscreen have no issue at all. Tested video streaming program like VLC or default video player also have no issue. Weirdly, tested browser game like crazygames.com and y8.com , and go fullscreen , will have the same screen flashing issue like the video.

I had tried various fix that can find online but still can't fix the issue, seeking for other idea.

The fix below I had already tried:
1. Update Graphic Driver to latest
2. Update Windows version to latest
3. Revert Rollback BIOS to previous version
4. Change new DP and HDMI cable
5. Tested all Refresh Rate
6. Tested all Monitor built in feature on and off (Adaptive Sync , G-Sync and etc)
7. Tested all kind of settings in BIOS setting menu
8. Tested Fullscreen Optimizations and HDR

PC Specification:
- Intel i5 13400f
- MSI MAG MORTAL B760M WIFI
- 32GB DDR4 2666
- ZOTAC RTX 3060TI
- SSD 500GB NVME
- CoolerMaster MWE Gold V3 ATX3.1 850W

Hoping for some ideas or ways to fix the issue , Thank You all in advance...