Steps to fix Mac BIOS beepsSeptember 10, 2020 by Archie Steele
If your PC displays a "Mac BIOS beeping" error, see these troubleshooting tips.
Mac beep indicates a problem with RAM. Have you recently updated? Shut down your Mac, hold Command + Option + P + R and turn it back on. Release the buttons when you hear the startup tone a second time. You can also insert the OS X installation DVD, restart C and open Disk Utility from the Utilities menu.
Here's a tip from Apple's website that mentions exactly what you're seeing: "3 long beeps, roughly three short beeps, three long positive beeps." I couldn't put Apple on "3 easy beeps, 3 huge long beeps, 3 fast beeps." These several tone combinations are clearly not the same overall.
Mac computers may want to play multiple tones when properly started. Your Mac should make a unique warm sound when it starts up. If you hear a different sound, it probably indicates a problem with your computer.
1 large beep when the Force button is pressed: Indicates that a pre-2012 computer system has had significant improvements in EFI ROM.
3 long beeps, many short beeps, much longer beeps: indicates that EFI ROM data corruption was detected, but the computer was always in EFI ROM recovery mode.
If anyone needs to restore an EFi ROM on 2008 certified Mac Macs, you'll want to use a recovery CD to actually restore the EFI ROM. New workswhose tables will automatically recover from the damaged ROM. When this happens, a progress club appears on a gray background. Do not disturb the entire computer while the specific ROM recovery is complete. When you restart, OS X will reboot. For more information on EFI ROM, see EFI - SMC Firmware Versions for Intel Mac Computers. "
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