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May 20, 2016 9:35 AM in response to ChadRoss58by leroydouglas,Hold the power button for an extended amount to force a shut down.
Try rebooting holding the shift key
When you first turn on your Mac, the screen is off (black) and you hear a startup chime. Your Mac initializes its BootROM and memory (RAM). It then performs a power-on self test (POST) and a BootROM test. If you hear additional beeps or chimes at this point, this indicates a possible hardware issue and startup halts. If you've added memory to your Mac, check to make sure it's installed properly.