Hi. I'm David, and I'm happy to help you.
First of all, I don't think you need to worry about storage. This issue is purely related to the display output and system graphics driver, not your storage.
Based on your description, I suspect that the graphics driver that was installed and working on Windows 8.1 is not compatible with Windows 10.
See if the same behavior occurs if you start Windows in Safe Mode.
You don't have to run Windows in Safe Mode forever. This is just a test to help isolate the source of the problem.
In the step involving the "Windows Recovery Environment" article, the method under "Automatic Repair" is the most suitable for your case.
At the "Startup settings" step, press 4 or F4 to start Windows in Safe Mode.
If your PC displays a screen when starting in Safe Mode, please share a screenshot of your system information.
- Press "Windows + R", type
msinfo32and press Enter.
Maximize the window and use the shortcut "Windows + Shift + S" to use the screenshot tool. Or take a picture of the screen using a camera or smartphone and share it.
Looking forward to your reply.