Ответ: Застрял диск в макбуке - решение проблемы
To eject a disc with Open Firmware commands, follow these steps:
1. Restart the computer.
2. Immediately after the startup sound, press and hold the key combination Command-Option-O-F.
Note: The Command key has the Apple icon on it.
3. Release the keys when you see a white screen that says "Welcome to Open Firmware."
4. At the prompt, type: eject cd
5. Press Return, then wait a few seconds. The disc drive should eject any disc that is present, and "ok" appears behind your command when the action is complete.
6. Type: mac-boot
7. Press Return.