Inspect the device visually, looking for damage to the connector and any signs of frayed wiring. If there is no apparent damage, take two different USB devices and test them against different ports. A USB device that works on one port but not another is a sign of a faulty port. If this is the case, the only real solution is to contact an authorized Mac specialist for a hardware diagnostics test and have the port repaired. Outdated firmware and software results in various hardware issues, including Yep — Mac USB ports not working.
Check for system updates by opening the App Store and clicking on the Updates tab. If updates are available, click on the Update button next to each application that you want to install. Resetting them could be the solution to your USB woes. If they aren't the reason for the USB ports acting up, you can easily reinstall them from the App Store. One way to remove apps is to use Launchpad or Finder.
SOLVED: My USB ports are disabled. - MacBook Pro 13" Unibody Mid - iFixit
Or you can use a quicker, more effective method: CleanMyMac X. Using the tool is every bit as easy as deleting an app manually. While CleanMyMac lets you uninstall apps in bulk, in this case, you should delete apps one at a time until you find the culprit. CleanMyMac also lets you clean up unwanted junk, declutter your Mac and improve performance.
Does the problem lie with your cable?
Having one or more USB ports not working on your Mac can be hugely frustrating, especially if you rely on those ports for data backup and external peripherals. That said, USB problems are quite rare and are usually easy to fix. Work your way through these troubleshooting tips until you find the one that works and restore your Mac to its full glory. How To.
Mac USB Ports Stopped Working? It’s Likely Easy to Fix
How to fix a faulty Mac USB port
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Fix Mac USB Ports Not Working
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