Device: MacBook Pro M4 (16 GB)
OS Version: macOS Tahoe 26.6.2, then upgraded to Golden Gate and the issue persisted
Issue:
Multiple I/O ports and connected peripherals suddenly stopped functioning properly.
Symptoms & Behavior:
- Headphones: 3.5 mm AKG Samsung wired earphones that previously worked without issue are no longer detected.
- HDMI & Display: The built-in HDMI port stopped outputting video. Using an official Apple USB-C multi-port dongle also yields no display.
- USB Accessories: A wired mouse connected through the USB-C adapter fails to respond.
- iPhone Syncing: Connecting an iPhone via USB provides power (the device charges), but the "Trust This Computer" dialog never appears, and the phone does not show up in Finder.
Troubleshooting Already Attempted:
- In System Settings > Privacy & Security > Allow accessories to connect, setting the option to "Ask every time" temporarily triggered the authorization prompt. This allowed both the earphones and the USB mouse to work for a single session, but the ports failed again shortly afterward.