Distorted audio startup boot

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Level 1

9 points

Distorted audio startup boot

Hi all,

I have a MacBook Pro 15" Mid 2015 (I bought it from Apple 2 months ago just before the release of the new ones).

90% of the time I have a distorted startup sound, like the typical chimes sound with a "crrrrr" sound in it, it's not incredibly distorted, but I work with audio, I can hear it I'm worried about that. Do you have the same with this model? I tried resetting Nvram but (cmd alt p r) but nothing changed.

Can you help me understand if something bad is going on or not?

Thanks

iMac Pro, macOS High Sierra (10.13.4)

Posted on Aug 3, 2018 12:05 AM

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Answer 1

leroydouglas

Level 10

200,244 points

Aug 3, 2018 9:56 AM in response to AndreaP83

Try a SafeBoot https://support.apple.com/en-us/HT201262

Takes noticeable longer to get to the login screen as certain system caches, dynamic loader cache etc get cleared and

rebuilt. After it is fully loaded

Reboot as normal and rry resetting NVRAM/PRAM http://support.apple.com/kb/ht1379

1. Shut down the computer.

2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.

3. Press and hold the Command-Option-P-R keys.

4. Turn on the computer.

5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.

6. Release the keys.

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Distorted audio startup boot

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