Your Mac might be turned on but appear to be turned off, even though it's connected to AC power and a working display. Follow these steps.
- Press and hold the power button on your Mac for at least 10 seconds, then release. If your Mac is turned on, this forces it to turn off.
- If you see no change on your Mac, press and release the power button normally.
- If your Mac now turns on but doesn't finish starting up, follow the steps for when your Mac doesn't start up all the way.
- If your Mac still doesn't turn on, please contact Apple Support.