Fix Please release the power button, We just need a few more seconds to shutdown issue on Windows by enabling PowerButtonBugcheck registry key.

If you see the Power Button Lockout message on your HP Monitor, press and hold the power button for about 10 seconds to restore its functionality.

Arguably, the power button placement on the new Mac mini is even worse, as turning the computer on and off (or forcing a reboot) might be something you do more often than you charge your mouse.