You can also cause your Mac to produce tones, usually with certain key combinations. While on this mode, you should not shut down or disturb the computer in any way until it completes the OS X boot.įor all of the tones on boot up we discuss above, you should look into contacting Apple tech support since they all indicate you’re your computer could be in dire need of maintenance. When this occurs, a progress bar appears on the screen during ROM recovery mode. ![]() Newer models recover automatically from a corrupted ROM. This means that your computer has detected an EFI ROM corruption and the computer is in EFI ROM recovery mode.
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