Hi 5u31a,
We appreciate you reaching out to us.
We’d like to gather additional details that may help us be in a better position to assist you.
Have you had the chance to force shutdown the device by pressing and holding the power button?
If yes and the issue persists, please boot into safe mode.
Safe mode does a basic check of your startup disk, similar to using First Aid in Disk Utility.
Performing this step may help resolve the issue, or further isolate the issue.
Below is an article to help guide you through the process.
How to use safe mode on your Mac - Apple Support
Also, the steps in the article below may help.
If your Mac starts up to a blank screen - Apple Support
Take care!