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Sep 21, 2020 • Filed to: Solve Mac Problems • Proven solutions
Do you own an Apple Mac computer and you noticed after a while that the USB accessories have been disabled? Don’t be perturbed because in this article we will show you how to enable USB accessories and get it working again.
If USB accessories are disabled, you will no longer be able to access saved data in your flash drive. A disabled accessory may be caused by an ignorant mistake on your part or a system malfunction. Regardless of whose fault it is, a disabled accessory won’t serve your interest in any way. Bearing this in mind, with the aid of the system management controller (SMC) you can enable USB accessories in your Mac computer once again.
About the SMC does and Why You Need IT?
Here are some of the functions performed by the SMC
- Activating power button when pressed
- Responds to opening and closing lids in MC notebooks
- Manages battery power
- Thermal management
- SMS (Sudden Motion Sensor)
- Light sensing (Ambient)
- Keyboard backlight
- SIL (Status indicator management)
- Video external source selector
How so you know when you need an SMC reset?
- When your Mac computer operating system is running at a very high speed even when it is not performing many tasks at once
- Inconsistent keyboard backlight
- Inconsistent indicator light
- Unresponsive ambient light
- When it doesn’t respond to closings and openings
- Unexpected sleep or shutdown modes
- Improper charge
- Slow response to commands
- Failing to recognize the external drive
- Doesn’t respond when you press the power button
Before you reset the SMC
Before you decide to reset your Max system to resolve a disabled USB accessory try all these steps first
- Press down the power until it shuts down
- Tap the command option then the Escape option to quit unresponsive applications
- Put Mac in sleep mode by clicking the Apple menu then click sleep. Once the system is asleep wake it up again
- Restart Mac by clicking Apple Menu
- Shut down Mac by clicking Apple menu then tap the power button again to switch it back on
If Mac is having Power issues follow these simple steps
- Unplug adapter for a minute then plug it again
- Click Apple menu to shut down
- After shutdown remove battery then re-insert it again
- Press the power button to turn the power back on again
If the accessory is still not enabled you may need to reset the system. Mp4 player mac os x. Follow these steps
Reset on MacBook notebooks
To reset Macbook, check if the battery can be removed. If the battery can’t be removed just
- Click Apple menu and shut the system down
- After the shutdown holds down the Shift + control option on the built-in keyboard and presses the power button at the same time. Hold all keys for 10 seconds. If your Macbook is a Pro the touch ID is also the power button.
- Release keys held down
- Press power key to turn Mac on again
If the battery is removable
- Shut system down
- Remove the battery
- Hold down the power key for about 5 seconds
- Fix battery back
- Press power key to turn the system back on
How to reset Mac desktop computers SMC
For Mac Pro, Mini, Xserve, and iMac follow these steps
- Click menu then shut down
- With for a few seconds
- Plug cable back to a power source
- Wait for some seconds then press the power key
If your system is an Xserve computer and it has failed to respond shut it down using commands.
How to reset SMC in Macs with Apple T2 Security Chip
- Click Menu then shut down
- After shut down hold down power for 10 seconds
- Release the button and wait for some seconds
- Press power key again to turn Mac back on
If this doesn’t work do this
- Choose menu then shut down
- Unplug power cable
- Wait for some seconds
- Plug cable back to a power source
- Wait for five seconds then switch Mac on
Mac notebook with the T2 chip
- Choose the menu and shut down
- After shutting down the press and hold the power key for about 10 seconds
- Release the key and wait for some few seconds
- Press power key to time Mac on
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If this step does not work follow these steps
- Choose the menu and shut Mac down
- After shutdown press, the Shift key left option key and left control key. Hold them down for 7 seconds. While these keys are held down hold down the power key for 7 seconds also
- Release all keys at once. Wait for a while
- Press the power button to turn Mac on
All the steps listed are very effective tips you can use to enable your USB Accessories on your Max Computer. It may take you some time but try to follow all the steps just as they are listed and you can be sure that your Mac system will work as well as before again.
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USB port types and names
USB (Universal Serial Bus) is an industry standard for connecting computers and other devices. It's available with many types of ports, and each type has a unique shape. On Mac computers, USB is available with these ports, depending on your Mac model:
USB-A
Type USB-A ports are commonly called USB, USB 2, or USB 3 ports, depending on the USB specification they support. They aren't reversible, so a USB-A connector plugs into the port only when oriented correctly.
USB-C
Type USB-C ports are available as either standard USB-C ports or Thunderbolt 3 ports that also support USB-C connections. They both look the same, and the connector plugs into the port in either orientation.
Learn more about identifying the ports on your Mac, as well as the adapters and cables you can use to connect older devices to type USB-C ports.
USB specifications
USB specifications are important primarily when you want the most speed and power for your USB device, or your device needs more power or is using too much power. Every USB port supports a particular USB specification, which determines the port's maximum>USB specifications on MacData transferPowerUSB 3.1 Gen 2
Also known as USB 3.2 Gen 2
Up to 10 GbpsUp to 15W at 5VUSB 3.1 Gen 1
Also known as USB 3.2 Gen 1 or USB 3
Up to 5 GbpsUp to 900 mA at 5VUSB 2.0
Up to 480 MbpsUp to 500 mA at 5VUSB 1.1
Up to 12 MbpsUp to 500 mA at 5V
To learn which specification is supported by a type USB-A or type USB-C port on your Mac model:
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- Choose Apple menu > About This Mac, click Support, then click Specifications.
- Check the System Information app for more details, including about USB devices connected to USB ports on your Mac. Select USB in the sidebar, then select a USB bus on the right.
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Get the best performance from your USB devices
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USB specifications all work with each other, but speed and power are limited by the cable or device that uses the earliest specification. For example, if you connect a USB 3 device to USB 2 port, your device is limited to USB 2 speeds, and it can't draw more power from the port than can be delivered over USB 2. In other words, to get the best performance, make sure that the USB port on your Mac and the USB cable to your device meet or exceed the USB specification of the device itself.
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If your Mac doesn't recognize a USB device after you plug it into your Mac:
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- Check all connections: Unplug the device from your Mac, then plug it back in, and make sure that all cables and adapters are securely connected at both ends. Test with another cable or adapter, if available.
- Plug the device directly into your Mac instead of a USB hub or other device, and if necessary test with a different USB port on your Mac or device.
- Some devices need their own software, such as drivers or firmware. Others work without additional software. Check with the maker of your device, and install all available Apple software updates as well.
- If your device came with an AC power adapter, use it. Some devices can be powered by the USB port on your Mac. Others need more power than your Mac can provide.
- Restart your Mac.
Learn more
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- USB 3 devices can create wireless interference that affects Wi-Fi and Bluetooth devices. Learn how to resolve Wi-Fi and Bluetooth issues caused by wireless interference.
- Mac notebook computers with USB-C or Thunderbolt 3 can charge over that port using a compatible USB-C power adapter and cable.