Microsoft's support article about Surface Pro screen flickering includes steps for confirming the issue. If it does confirm ...
Ensuring that your Surface Pro 9 has the latest Windows and firmware updates is crucial. To update, press WinKey + I to open the Settings app, then navigate to Updates & Security > Windows Update > ...
For a force shutdown, press and hold the Power button for about 30 seconds until the screen turns off. Then, press and hold the Volume-up button and the Power button simultaneously for about 15 ...