Hi Trinity,
Welcome to the Microsoft community. It sounds like you're experiencing a serious issue with your Surface Pro 7+ where the display remains black during startup or wake-up and only the mouse pointer is visible. The system seems to be partially functional, as you can see the clock and swipe-up indicator, but can't interact with the login screen until it's left on the charger for an extended period. Given your troubleshooting efforts, here are a few more steps to consider: Safe Mode, which starts Windows in a limited state, starting only the most important services and drivers. If a problem doesn't reappear when you start in safe mode, you can eliminate the default settings, basic device drivers, and services as possible causes.
- Access the Windows Recovery environment You can also force Windows to enter automatic repair by interrupting the normal boot process twice. This can be done by turning on the device, then pressing and holding the power button to force a shutdown before Windows finishes loading. After doing this twice, Windows should automatically boot into Windows RE on the third reboot.
- Once in Windows RE, select Troubleshoot > Enhanced Options > Startup Settings > Restart.
- Select Restart
- Once the device has restarted, select one of the available options on the Startup Settings screen, or press Enter to start Windows normally.
If you are able to enter safe mode, try the following:
- Run the Surface Diagnostic Toolkit: Fix common Surface problems using the Surface app and Surface Diagnostic Toolkit - Microsoft Support
- Manually update Surface drivers and firmware: Download drivers and firmware for Surface - Microsoft Support If nothing has worked so far, consider using your Surface's USB recovery drive to restore it to its factory settings to fix any damaged system files. Creating and using a USB recovery drive for Surface - Microsoft Support I hope this helps. If there is anything not clear, please do not hesitate to let me know. Your SincerelyHahn. W - MSFT | Microsoft Community Support Specialist