System Integrity Protection is a security technology in OS X El Capitan and later that's designed to help prevent potentially malicious software from modifying protected files and folders on your Mac. System Integrity Protection restricts the root user account and limits the actions that the root user can perform on protected parts of the Mac operating system.
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Before System Integrity Protection, the root user had no permission restrictions, so it could access any system folder or app on your Mac. Software obtained root-level access when you entered your administrator name and password to install the software. That allowed the software to modify or overwrite any system file or app.
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System Integrity Protection includes protection for these parts of the system:
- /System
- /usr
- /bin
- /sbin
- /var
- Apps that are pre-installed with OS X
Paths and apps that third-party apps and installers can continue to write to include:
- /Applications
- /Library
- /usr/local
System Integrity Protection is designed to allow modification of these protected parts only by processes that are signed by Apple and have special entitlements to write to system files, such as Apple software updates and Apple installers. Apps that you download from the Mac App Store already work with System Integrity Protection. Other third-party software, if it conflicts with System Integrity Protection, might be set aside when you upgrade to OS X El Capitan or later.
System Integrity Protection also helps prevent software from selecting a startup disk. To select a startup disk, choose System Preferences from the Apple menu, then click Startup Disk. Or hold down the Option key while you restart, then choose from the list of startup disks. Come out mac os.
Your device isn't recognized by your Mac
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.
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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 Bluetooth 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.
Make sure that your device has been set up to work with your Mac
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 click Bluetooth. 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.
| Bluetooth menu icon | Bluetooth status |
|---|---|
| Bluetooth is on, but no wireless devices are connected to the Mac. See the Make sure that your wireless mouse, keyboard, or trackpad is turned on section of this article. | |
| Bluetooth is on and at least one wireless device is connected. | |
| When this icon flashes, at least one wireless device has a low battery. Click the Bluetooth icon to identify the affected device, then recharge the device or replace its batteries. | |
| Bluetooth is off. Click the Bluetooth icon using a USB mouse or built-in trackpad and select Turn Bluetooth On. | |
| Bluetooth is offline or unavailable. Restart your Mac. If the Bluetooth status doesn't change, disconnect all USB devices and restart your Mac again. |
Make sure that your devices are charged
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. Switchero mac os. 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
- 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 wireless interference.
Your mouse doesn't scroll up or down or side to side
If you can't use your mouse to scroll through a web page or document, make sure that you're using the correct Multi-Touch gestures and have set up your scrolling speed preferences correctly.
Your mouse or trackpad doesn't track as expected
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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 Bluetooth 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.
Make sure that your device has been set up to work with your Mac
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 click Bluetooth. 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.
| Bluetooth menu icon | Bluetooth status |
|---|---|
| Bluetooth is on, but no wireless devices are connected to the Mac. See the Make sure that your wireless mouse, keyboard, or trackpad is turned on section of this article. | |
| Bluetooth is on and at least one wireless device is connected. | |
| When this icon flashes, at least one wireless device has a low battery. Click the Bluetooth icon to identify the affected device, then recharge the device or replace its batteries. | |
| Bluetooth is off. Click the Bluetooth icon using a USB mouse or built-in trackpad and select Turn Bluetooth On. | |
| Bluetooth is offline or unavailable. Restart your Mac. If the Bluetooth status doesn't change, disconnect all USB devices and restart your Mac again. |
Make sure that your devices are charged
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. Switchero mac os. 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
- 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 wireless interference.
Your mouse doesn't scroll up or down or side to side
If you can't use your mouse to scroll through a web page or document, make sure that you're using the correct Multi-Touch gestures and have set up your scrolling speed preferences correctly.
Your mouse or trackpad doesn't track as expected
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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 click Mouse. Set the 'Tracking speed' slider to adjust how fast the pointer moves as you move the mouse.
- Try using a different surface to see if 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.
Learn more 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.
- Choose Apple menu > System Preferences, then click Keyboard.
- Click the Input Sources tab.
- Make sure that the keyboard language that you use is listed on the left side. If it's not, click the add button (+) and choose from the languages that appear.
- Select the 'Show Input menu in menu bar' checkbox.
- Click the Keyboard tab, then select 'Show keyboard and emoji viewers in menu bar' checkbox, if present.
- From the Input menu in the menu bar, choose Show Keyboard Viewer. The Keyboard Viewer showing the keyboard layout appears on your display.
- 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. To turn off Mouse keys, choose Apple menu > System Preferences, then click Accessibility. Choose Mouse & Trackpad from the list on the left side, then then deselect the Enable Mouse Keys checkbox.
