The video doesn't play; only the audio works, and the screen remains black.

I have finished editing the video, but suddenly the program monitor went black; it only plays the audio, not the video. I wonder if it might have something to do with the fact that I updated my graphics card (which is new).
Here are my computer specifications:

Processor    12th Gen Intel(R) Core(TM) i3-12100F (3.30 GHz)
Installed RAM    64.0 GB (63.8 GB usable)
Graphics card    NVIDIA GeForce RTX 5050 (8 GB)
Storage    715 GB used out of 1.86 TB
System type    64-bit operating system, x64-based processor
Pen and touch    No pen or touch input is available for this display