No idea what’s wrong with my MacBook

lauren-e Said:

"No idea what’s wrong with my MacBook:[...] Neither of us were able to figure out what’s going on with it. I’m sure an issue with the battery is part of it, but it doesn’t seem like that’s the only thing going on. Any advice/input would be super appreciated, I’m really lost."

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Troubleshoot Power:

A. Try a New Charger:

• Power & Cables - Mac Accessories - Apple - Select "Mac Compatibility" on the left
• Find the right power adapter and cable for your Mac notebook - Apple Support

B. A Few Links to Refer to for Power:

• How to turn your Mac on or off - Apple Support

• About Mac notebook batteries - Apple Support

• Charge the MacBook Pro battery - Apple Support

• If your Mac battery won't charge - Apple Support

lauren-e Said:

"No idea what’s wrong with my MacBook:[...] The person from Apple support walked me through some diagnostics and resets and had me update to the most recent OS version (Big Sur 11.2.3 I believe) because I was behind. [...] Seems like it. But I feel like there’s more to it, I could be wrong though. The battery’s definitely part of what’s going on, but I don’t know if it explains the weird volume issue."

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Troubleshooting Volume:

Volume would have to do with the installation - So, try reinstalling the macOS. Once installed, all should be fine from there. What may have happened is probably it is an application creating this malfunction.

Reset the Core Audio:

See the screenshot in the below reply

1. Boot into Recovery Mode: [Hold Down: command + R upon boot]
2. Enter: your credentials (if prompted)
3. Click: Utilities menu (at the top of the window)
4. Select: Terminal
5. Enter: this command, then press the return key, and then enter the admin password.

sudo killall coreaudiod

Reinstall the MacOS:

As for fixing all of this power issue, you may need to reinstall the macOS. Reinstalling the macOS will place moved items back to where they should be, and will replace damaged system files.

1. First, Back up your Mac:

If you can boot up, create a Time Machine backup of your Mac, so that you can have something to restore your Mac from, should anything go wrong with the reinstall. Use an external Hard Drive of at least 1.5 times the size of your internal hard drive.

2. Then, Reinstall the macOS:

Nothing would be deleted. It's just that items that have become corrupted or deleted, would be replaced or reinstalled back to where they should be. Go Here: How to reinstall macOS from macOS Recovery - Apple Support

Screenshot of resetting the Core Audio in Terminal (with personal info blocked out).

lauren-e Said:

"No idea what’s wrong with my MacBook: [...]tried them all, no luck :("

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Seems it's time for a new battery.