Other Considerations for USB Not Working on a Mac. If a single USB port has failed but other USB ports are continuing to work on the Mac, even after an SMC reset, there may be an issue with that specific hardware USB port – you can either avoid using that USB port and instead use a USB hub for one of the other functioning ports, or you can have Apple run a hardware diagnostics test on the.

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Your device isn't recognized by your Mac

• How to Troubleshoot Mouse Problems on a Mac Computer. Check your mouse's cable connection if you are using a wired mouse. Unplug the cable from the computer and plug it in to a different USB port to see if it resolves the issue. Plug the mouse directly into a port on the computer or the side of the keyboard, not through a USB hub or switch.
• USB Unifying receiver USB receiver to be used with a Unifying mouse or keyboard. $ 14.99 Mouse M100 Corded full-size comfort $ 9.99.
• A mouse with a USB dongle functions similarly to Bluetooth and requires batteries, but takes up one of your USB ports on the Mac which is super precious if you’re on a newest MacBook model. The Best Mouse for MacBook Pro in 2019: Our Picks.
• I've only been on OS X for 2 days! So I am pretty new. Basically when I plugged in my Targus USB mouse it popped up that I was replacing the keyboard, it said if I wasn't then just to ignore the message and carry on, so I crossed it but my mouse isn't been detected by my Macbook Pro. The red light.

Follow these steps if your mouse, keyboard, or trackpad isn't recognized by your Mac.

Make sure that your wireless mouse, keyboard, or trackpad is turned on

The Magic Mouse and Magic Mouse 2 have a slide switch on the bottom of the device. Slide the switch to turn on the device. On the Magic Mouse, the green LED briefly lights up. On the Magic Mouse 2, green coloring is visible beneath the switch.

The Magic Keyboard, Magic Keyboard with Numeric Keypad, and Magic Trackpad 2 have a slide switch on the back edge of the device. Slide the switch to turn on the device (green coloring becomes visible). Earlier Apple Wireless Keyboard models have a power button on the right side of the device. Press the button and you see a green LED on the top of the device, near the button.

When you turn these devices on, they appear as Connected in the Bluetooth section of System Preferences and in the Bluetooth menu in your menu bar. If a device doesn't appear there, make sure it's charged or replace it batteries, and make sure it's been paired with your Mac.

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Make sure that your device has been set up to work with your Mac

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Learn how to pair your Magic Mouse 2, Magic Keyboard, Magic Keyboard with Numeric Keypad, Magic Trackpad 2—and earlier models of Apple wireless devices—with your Mac.

Make sure that Bluetooth is turned on

Use your Mac notebook's built-in trackpad or a USB mouse to choose Apple () menu > System Preferences. Then select Bluetooth and make sure that Bluetooth is turned on.

Refer to the table below for more information on determining the Bluetooth status. If the Bluetooth icon doesn't appear, or if the menu bar status continues to indicate that Bluetooth is off, restart your computer and then try to turn Bluetooth on again.

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Make sure that your devices are charged

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Magic Mouse 2, Magic Keyboard, Magic Keyboard with Numeric Keypad, and Magic Trackpad 2 have built-in rechargeable batteries. You can charge these devices by connecting them to a Mac or a USB power adapter using a Lightning to USB Cable. For the fastest battery charging performance, be sure your device is switched on when connected to the Lightning to USB Cable.

To check the battery level of these devices, click the Bluetooth icon in your Mac's menu bar, then select your device by name. If the battery level of any device is low, recharge the device. If the device isn’t showing, make sure the device is turned using the steps outlined above.

Turn the device off and on

If your Apple wireless mouse, keyboard, or trackpad isn't recognized by your Mac after following the tips above, try turning the wireless device off, waiting a few seconds, and then turning it back on.

Your mouse or keyboard intermittently stops responding

Follow these steps if your mouse or keyboard sometimes stops responding temporarily.

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Click or press a key

• Click the mouse or trackpad or press a key on the keyboard to reconnect the device to the computer. It might take a moment for the device to respond.

Check for signal interference

• Wireless networks that operate on 2.4GHz may cause interference. Move cordless phone base stations, microwave ovens, and other 2.4GHz electrical devices away from your Mac if you suspect interference.
• Keep wireless devices within 10 meters (approximately 30 feet) of your Mac.
• Avoid putting metal objects between your wireless device and your Mac.

Your mouse doesn't scroll up or down or side to side

Alfred for mac. If you can't use your mouse to scroll through a web page or document, see Mac Basics: Multi-Touch gestures to make sure your Gestures are configured correctly. You can also try adjusting your scrolling speed preferences.

Your mouse or trackpad doesn't track as expected

Apple Wireless Mouse, Magic Mouse, and Magic Mouse 2 can be used on most smooth surfaces. If tracking issues occur, try these options:

• Choose Apple menu > System Preferences, then select Mouse. Set the Tracking slider to adjust how fast the pointer moves as you move the mouse.
• Try using a different surface to see if the tracking improves.
• Turn the mouse over and inspect the sensor window. Use compressed air to gently clean the sensor window if dust or debris is present.
• If multiple Bluetooth wireless devices are in use nearby, try turning them off one at a time to see if the issue improves. Bandwidth intensive devices can affect tracking.

Learn more about what to do if your trackpad isn't tracking correctly.

Your keyboard has one or more keys that don't respond

Use the Keyboard Viewer to test whether the keyboard keys are responding correctly when they are pressed.

1. Choose Apple menu > System Preferences, then select Language & Region.
2. Click the Keyboard Preferences button.
3. Click on the Input Sources tab.
4. Make sure that the keyboard language that you use is listed on the left side. If it's not, click and choose from the languages that appear.
5. Select the checkbox next to Show Input menu in menu bar.
6. Click on the Keyboard tab, then select the checkbox next to Show keyboard and emoji viewers in menu bar.
7. Choose Show Keyboard Viewer from the Input menu in the menu bar. The Keyboard Viewer showing the keyboard layout appears on your display.
8. Type the key on the keyboard that doesn’t respond and see if the corresponding key highlights on the Keyboard Viewer. If it does, that key is functioning correctly.

If you enable the Mouse Keys feature, many keys might not respond as you expect. Here's how to turn off Mouse Keys:

• In OS X 10.8 or later, choose Apple menu > System Preferences. Click on Accessibility, then choose Mouse & Trackpad from the list on the left side. Then deselect the Enable Mouse Keys checkbox.
• In OS X 10.7.5 or earlier, choose Apple menu > System Preferences. Click on Universal Access, then select the Mouse & Trackpad tab. Then select the Off button next to Mouse Keys.

If issues with keys persist, try starting up your Mac in single-user mode to see whether a software issue is causing the problem.