One of the reasons why a mac frozen screen can be caused could be overloaded applications, software malfunction, lack of memory, or system conflicts. The first thing you can do is press Command + Option + Escape to open Force Quit and close the unresponsive applications. If the screen is still frozen, you can restart your Mac by holding down the power button for a few seconds. Once your computer is back on, you should look for macOS updates, remove some files to create more space, and check the processes running in the background via Activity Monitor. If the problem of the Mac frozen screen persists, then boot into Safe Mode or do a run Apple Diagnostics to further troubleshoot the problem.
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