- macos - Reset USB bus without reboot (MacBook ignores display) - Ask Different
- Check the connection
- USB 3.0 Hub Stops Working on El Capitan
If it only works when you switch to a different machine, then you've probably got a Mac-wide issue. In either case, you should try some of the fixes further down, which may clear things up and should confirm where the problem lies. If it doesn't work wherever you plug it in, then the problem probably lies with either the cable or the device you're plugging into the Mac. We'll look at that next.
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- Check the device is recognised on the USB bus?
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If it's a reasonably portable Mac, you could take it into the Apple Store and they'll let you borrow a cable - and you'll be in the right place to get a repair if it proves necessary. Keep everything as it was - same port, same Mac, same device - but connect them with a different cable. Does that fix the problem? If so, the first cable is almost certainly faulty, and you just need to replace it which is pretty cheap , luckily.
If the cable isn't the problem - ie using a different one doesn't solve the issue - then we should repeat the test with a different device on the end. If this fixes things, then there's a problem with the device or its port.
macos - Reset USB bus without reboot (MacBook ignores display) - Ask Different
If you suspect your Mac is the problem, there are three sensible steps, each of which may sort matters out, that you should try before you resort to paying for a repair. Our first port of call would be to reset the SMC which stands for System Management Controller , which is pretty straightforward.
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But if you were planning on updating macOS anyway, you might like to try that one first instead. Keep holding them until you hear the Mac restart again. Apple says to let it restart just once; we usually listen for a second reboot, then release the keys. Either way, you should now check to see if it's fixed the problem with the USB port.
Check the connection
Updating your Mac to the latest version of macOS is a reasonably quick and simple process that in most situations is a good idea anyway. Outdated firmware and software results in various hardware issues, including Yep — Mac USB ports not working.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. Or you can use a quicker, more effective method: CleanMyMac X. Using the tool is every bit as easy as deleting an app manually.
USB 3.0 Hub Stops Working on El Capitan
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. 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. Blog How To News. Hit Return or Enter to search. What to do if your Mac USB ports are not working. Darina Stavniychuk.