Know What a USB Port Looks like. There are two types of USB ports included in computers today. 2-meter version USB-C to Lightning Cable (1m) USB-C to 4-Port USB 3.0 Hub The new MacBook Pro comes with two or four external ports, depending on the model you pick. And the new MacBook Air has a.
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Before we get into the software fixes, let’s start with the simplest solution of all: restarting your Mac. Switch the Mac off and back on again. You’ll be surprised at how many problems a quick restart solves.
Next, check the USB device. There’s a chance that it could have failed, particularly so if you’re using a cheaper cable. 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. If the devices aren’t working on one or all of the ports it’s more likely to be an issue with your Mac and not the device.
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.
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If the device doesn’t work in any of your ports, then continue reading for some potential fixes.
What to do if Mac USB devices are not working
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All of your Mac or MacBook USBs not working is actually better news than one failing. It’s unlikely that all of your ports would fail at once which means the fix is probably an easy one.
Here are three things to try, starting with the most common fix.
1. Reset the SMC
Resetting the SMC (System Management Controller) is a simple fix that cures a wide range of hardware issues. How this is done depends on whether you’re using a MacBook or Mac desktop.
Resetting the SMC on a MacBook
- Shutdown your MacBook.
- Connect the power adapter.
- Hold Shift+Control+Option and the Power button at the same time.
- Release all the keys at the same time.
- Let your MacBook boot up as usual and the SMC will be reset.
Resetting the SMC on an iMac, Mac mini, or Mac Pro
- Shut down your Mac.
- Disconnect the power cord.
- Press and hold the Power button for 5 seconds and release.
- Reconnect the power cord and switch the Mac back on.
2. Check for updates
Outdated firmware and software results in various hardware issues, including... Yep — Mac USB ports not working.
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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.
3. Reset PRAM/NVRAM
The PRAM (Parameter RAM) and NVRAM (Non-Volatile RAM) hold information about various USB components. Resetting them could be the solution to your USB woes.
It’s a slightly different process to resetting the SMC, but no less difficult.
![Usb Ports For Mac Usb Ports For Mac](/uploads/1/1/9/4/119499609/387198972.jpg)
- Shutdown your Mac.
- Restart it, holding down Command+Option (ALT)+P+R as you do.
- Hold down the keys until you hear a sound and see the screen flash.
- Listen for the chime sound and let the Mac boot up as usual.
4. Uninstall potentially conflicting apps
If the USB ports not working on your MacBook Pro or iMac is a recent issue and there doesn’t seem to be any problem with USB devices, it could be that an app is conflicting with USB functionality. If you’ve downloaded an app from an unknown source there is the potential for it to contain malware, which could also be the cause of the problem.
In any case, it’s worth uninstalling recently downloaded and installed apps. 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.
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To completely remove an app and every file associated with that app, use CleanMyMac.
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CleanMyMac’s Uninstaller tool scans your entire system for every trace of an app and completely removes it. Using the tool is every bit as easy as deleting an app manually.
- Download and launch CleanMyMac (free download).
- Click on Uninstaller from the sidebar menu.
- Select the app that you want to remove from the list.
- Click Complete Removal in the Smart Selector panel.
- Hit Uninstall.
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.
One way to uninstall apps manually is by using the Launchpad:
- Open the Launchpad.
- Find the app that you want to remove and click and hold the icon until it starts to jiggle.
- Click on the X that appears in the corner of the app, then click Delete.
You can also uninstall apps from the Finder:
- Open the Finder and go to Applications.
- Find the app that you want to remove and drag its icon to the Trash (you might need to enter your admin credentials to confirm you want to delete the app).
- Click on the Trash icon and select Empty Trash.
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.
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by Jenefey AaronUpdated on 2020-01-10 / Update for OS X
As flawless as a Mac can be, it is not completely immune to issues and sometimes the USB ports on the Mac can stop working inexplicably. You know you didn't do anything to cause the problem, but all of a sudden all your USB ports not working on Mac. This issue can be frustrating. But before you think that the problem is the Mac, consider that sometimes USB devices can fail.
1. Check the Connection
Like we mentioned above, it is likely that the Mac is not the problem at all but the USB itself is failing to connect to the Mac. To check if this is a connection issue and that the USB you are using is damaged or not, try connecting a different USB device to the Mac to see if it's recognized. If the program recognizes a different USB device, the problem is not the Mac; you just need to change the USB device you are using.
You may also want to check the USB ports on the Mac to make sure there isn't any debris or dust lodged in it. If there are, use a soft cloth to clean out the dust or a toothpick to remove any debris.
2. Restart the Mac
This problem can also be caused by a software issue. In this case, you may want to restart the Mac to eliminate any software issues that could be causing problems. Follow these simple steps to restart the Mac;
- Step 1: Click on the menu button located at the top left corner of the screen
- Step 2: Click 'Restart'
- Step 3: Confirm that you want to restart the Mac by clicking on the 'Restart' button in the menu that appears.
3. Inspect the Port and Cable
Just to make sure that it is not a hardware problem, you may want to check that the USB port on the Mac is working fine. Dust and debris can be easily removed like we mentioned in the first solution above, and you can also try using different USB devices to see if they are the problem.
![Enable usb devices mac Enable usb devices mac](/uploads/1/1/9/4/119499609/768556294.jpg)
4. Update SMC
If you are certain the problem is not the USB device or the cable, the easiest way to fix the USB not working on Mac problem is to reset SMC. The process is slightly different for different Mac models. Here's how to do it for a MacBook, MacBook Pro and a MacBook Air;
- Step 1: Shut down the Mac and then connect it to the power cable.
- Step 2: Hold down the Shift, Control, Option and Power buttons at the same time for a few seconds. When the power adapter blinks or changes color the SMC reset will be complete.
- Step 3: Release the keys and then turn on the Mac.
5. Reset the PRAM/NVRAM
Sometimes resetting the PRAM or NVRAM can fix the USB ports not working on Mac issue simply because the NVRAM holds the data about the keyboards, trackpad, mouse and USB components. Follow these simple steps to reset the NVRAM;
- Step 1: Restart the Mac and then immediately hold down the Command + Option + P+ R keys together until you hear a sound and the screen flashes.
- Step 2: The Mac will also make another chiming sound before restarting again.
6. Update the Mac
An update of the software on your Mac is also another way you can fix problems with USB connectivity. Follow these simple steps to update your Mac;
- Step 1: Open the App store app o your Mac
- Step 2: Click on 'Updates' in the App Store toolbar
- Step 3: You can then either simply click on 'Update All' or go through each software updating individually
Most software problems on Mac often result in data loss. If you have suffered data loss for one reason or another, you may need a reliable data recovery program. One of the best data recovery programs for Mac is Mac Data Recovery. Once downloaded on your Mac, the program will scan the device for the missing data and then recover it.
When the Mac USB ports are not working, the solutions above can easily help you fix it. If it is a hardware problem, you may want to consider other options like having a professional fix the device.
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