I'm sorry to hear about the issue you're experiencing after the system update. Based on the information you've provided, it seems like the screen resolution or refresh rate settings have been changed to a value that is not supported by your monitor. To resolve this issue, you can try the following steps:
1. Start by booting your computer in Safe Mode: Restart your PC, and when it begins to boot, press and hold the F8 key until the advanced boot options menu appears. From there, select Safe Mode and hit Enter.
2. Once you're in Safe Mode, right-click on the desktop and select Display settings (or Screen resolution).
3. In the Display settings window, try changing the resolution to the recommended value of 1280 x 1024. You may need to experiment with different resolutions to find the one that works best for your monitor.
4. If changing the resolution doesn't fix the issue, try adjusting the refresh rate. Go to the Advanced display settings (or Display adapter properties) and select the Monitor tab. From there, you can change the refresh rate to a value that is supported by your monitor. Usually, a refresh rate of 60Hz is the standard.
5. After making the necessary changes, click Apply and then OK to save the settings. Restart your computer normally to see if the issue is resolved.
If the above steps don't resolve the issue, it's possible that the system update may have caused a driver conflict or compatibility issue with your graphics card. In that case, you may need to update or reinstall the graphics driver. You can do this by going to the manufacturer's website for your graphics card and downloading the latest driver for your specific model.
I hope these steps help you resolve the screen resolution error you're encountering. If you continue to experience difficulties, feel free to provide more details, such as your operating system and the model of your monitor, so that we can assist you further.