Tones on Starting Sometimes you'll turn your Mac on and it'll start beeping in a variety of patterns. A successive sequence of 3 long tones, 3 short tones, 3 long tones, etc. User-Induced Tones You can also cause your Mac to produce tones, usually with certain key combinations.
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Option-D Same above, but it will start these programs via the internet. N Start up from a compatible NetBoot server.
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Option-N Start up from a NetBoot server using the default boot image. Command-Option-R Same as above, but using the internet.
About Mac startup tones
Lyve Data Labs. Data Security. Our Story. Seagate Champions. Software Downloads. Explains a few beep codes for legacy Mac computers. If a fault is detected during the test, you will not hear a normal startup chime. Instead, the system will beep as explained below.
If you experience one of these beeps, you should call your Apple-authorized service provider for additional troubleshooting assistance. Selecting a different country will clear your cart.
Europe, Middle East, Africa. These errors can range from simple, temporary errors to severe hardware problems that require repair by Apple technicians.
Macintosh Beep Codes
The MacBook Air sacrifices accessibility for convenience, so you can't open it up to fix anything yourself. You can perform troubleshooting to narrow down the problem or fix it yourself, but back up your data before anything else to avoid losing important work. The System Management Controller is responsible for your MacBook's operating temperature, fan speed and power flow. It normally runs fine and does not need any input from the user. If the SMC does need to be reset, or if some error associated with it causes your MacBook to overheat, you can reset it with a short process.
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Shut down your computer completely and then plug in the power cable if it is not already plugged in. Hold for five seconds and then release.
Press the power button again to turn on your computer to see if it worked. NVRAM contains user-setting information such as speaker volume, screen resolution and default startup disk selection.