If all fails, contact Apple Support, go to an Apple Store, or check out an authorized service provider to have your Mac examined by a technician to determine if there is any hardware problemīy following these steps, you should be able to troubleshoot USB-C port issues on your MacBook Pro, MacBook Air, MacBook, Mac Mini, iMac, Mac Pro, or Mac Studio, and hopefully resolve the issue. If you are seeing a “USB Accessories Disabled” message you may have too many devices plugged into the Mac. Try using the same Thunderbolt / USB-C port with a different device, to rule out the problem is not device/peripheral specific. If using a USB-C hub, try directly connecting to the Mac and unplugging the USB-C hub, dongle, or adapter. Try different USB-C cables or adapters, since occasionally there are issues with the cables themselves. Most Macs have multiple Thunderbolt/USB-C ports, and sometimes if a device doesn’t work on one port, it may work when connected to another Often simply restarting a Mac can resolve random issues like spontaneous or inexplicable problems with hardware or software, and USB-C ports are no different Next, check for any damage to the cable, since a damaged cable can cause connectivity issues. Some third party USB-C cables need to be given an extra push to make sure they’re inserted and connected 
First, check the physical connection to make sure the USB-C cable is securely attached to the Mac, and to the device that you are trying to connect.Try out these troubleshooting steps to resolve issues with Thunderbolt / USB-C / USB-4 ports on a Mac, including a MacBook Pro, MacBook Air, MacBook, Mac Mini, iMac, Mac Studio, or Mac Pro. Troubleshooting USB-C / Thunderbolt Ports Not Working on Mac If you have this experience, there are a variety of steps you can take to troubleshoot the issue and get your Thunderbolt / USB-C ports working again.
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