MacBook Pro lines on screen

Hi MacbookVI,

We see that your display is not working correctly. We have a few steps you can try to fix this.

Does anything change if you restart your Mac? Since you're unable to power it off normally, you can force it to shut down by pressing and holding the power button. Keep in mind, any unsaved changes to documents may be lost.

If this behavior continues after a restart, we recommend performing the following resets in order. Be sure to see if it is resolved after each step.

Reset NVRAM or PRAM on your Mac

How to reset the SMC of your Mac

If those steps don't help, your Mac will need to be serviced. You can start a service request and locate nearby service locations from the following link. Choose your country, then Service & Support: Find Locations

Hope that helps!

Cheers!