连接iPhone至MacBookPro出现USB Accessories Disabled错误，重置SMC无效求助

Hey there, sorry to hear you're stuck with this frustrating error after connecting your iPhone to your MacBook Pro—especially since resetting the SMC didn't resolve it. Let's walk through some targeted troubleshooting steps that might get this sorted out:

• Inspect your cable and ports

  • Swap in an MFi-certified Lightning/USB-C cable—cheap or uncertified cables often cause inconsistent power delivery that triggers this error.
  • Clean out the USB-C ports on your Mac and the charging port on your iPhone with a soft brush or compressed air; dust buildup can cause poor contact that skews power draw readings.
  • Try connecting to a different USB-C port on your Mac—sometimes individual ports develop minor hardware glitches.

• Adjust Mac's USB power settings

  • Open System Settings → Battery → Options (on older macOS versions, this might be under Energy Saver).
  • Look for USB power-related settings: ensure you haven't enabled a power-limiting mode, and if your Mac is plugged in, confirm "Provide power to external devices" is turned on.
  • If you're running on battery power, switch to using your Mac's charger—battery mode restricts USB port output, which can trigger the high-power error even with a normal device.

• Reset NVRAM/PRAM

  • SMC handles power management, but NVRAM/PRAM stores hardware configuration data that can sometimes interfere with USB behavior.
  • How to do it: Shut down your Mac, then hold Command + Option + P + R while turning it on. Release the keys after you hear the second startup chime (or see the Apple logo flash twice on newer models).

• Check iPhone settings and state

  • Update your iPhone to the latest iOS version—older software can have USB compatibility bugs that cause false high-power detections.
  • Turn off Low Power Mode and Optimized Battery Charging on your iPhone; these modes alter the device's power demands, which might confuse your Mac's power monitoring.
  • Restart your iPhone and try connecting again—temporary system glitches can sometimes trigger this error.

• Test in Safe Mode

  • Boot your Mac into Safe Mode by holding the Shift key while turning it on (release when you see the login window).
  • Connect your iPhone here—if the error doesn't appear, a third-party app (like antivirus tools or USB management software) is likely interfering. You can uninstall recently added apps one by one to find the culprit.

• Rule out hardware issues

  • If none of the above works, test connecting your iPhone to another Mac or Windows PC. If the same error pops up, the problem is likely with your iPhone's charging module. If it works on other devices, your Mac's USB controller or port might have a hardware fault—reach out to Apple Support for further testing.

内容的提问来源于stack exchange，提问作者Yodgorbek Komilov