That would be graphics card to check in the first place.
Absolutely, you're right. If the problem persists even after updating or reinstalling the GPU drivers, it might be a hardware issue with your graphics card. Power surges can cause unexpected damage to the hardware components of your computer, including the graphics card.
Here's how you can check if your graphics card might be having problems:
1. **Unusual Behaviour:** Besides the monitor issue, observe if your computer exhibits unusual behavior like frequent crashes, blue screens, random restarts, or if your screen displays odd colors or patterns.
2. **Run a Stress Test:** There are several programs available (such as FurMark) that can run a stress test on your graphics card to determine if it's functioning correctly.
3. **Check Temperatures:** Overheating can cause a lot of issues with graphics cards. You can check the current temperatures of your GPU either through BIOS (on start-up of your PC) or via software such as HWMonitor.
If your graphics card seems to be the issue, and if it's within warranty, you can reach out to the manufacturer for a replacement or repair. If it's not under warranty, you might need to consider purchasing a new graphics card.
Remember, while diagnosing and replacing hardware components, if you're not comfortable or experienced in doing so, it's always recommended to consult with a professional to avoid any potential damage to your system.
Please let us know if you need further assistance.