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현재 버전 게시자: Dan ,

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From a second Mac create a bootable OS installer thumb drive following this guide: [http://www.macworld.com/article/3092900/macs/how-to-create-a-bootable-macos-sierra-installer-drive.html|How to create a bootable macOS Sierra installer drive].
 
Then see if your system will boot up under it. You'll need to hold the Option key just when you hear the Bong so you can gain access to the drive manager to select the external drive. Once their, run Disk Utility to check your drive. If you have a backup delete the partition and re-install the OS. Let us know how it goes!
 
=== Update (03/27/2017) ===
 
is there a pattern in the sound? Here's a good Apple T/N writeup on the different startup sounds and the basic causes: [https://support.apple.com/en-us/HT202768|About Mac startup tones].

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원문 게시자: Dan ,

텍스트:

From a second Mac create a bootable OS installer thumb drive following this guide: [http://www.macworld.com/article/3092900/macs/how-to-create-a-bootable-macos-sierra-installer-drive.html|How to create a bootable macOS Sierra installer drive].

Then see if your system will boot up under it. You'll need to hold the Option key just when you hear the Bong so you can gain access to the drive manager to select the external drive. Once their, run Disk Utility to check your drive. If you have a backup delete the partition and re-install the OS. Let us know how it goes!

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open