Many Mac users have aMagic Mouseor aMagic Trackpadpaired with their desktop Macs.
Many also have wireless keyboards, speakers, phones, or other devices connected through a Bluetooth wireless connection.
Bluetooth is convenient for peripherals that are always connected to your Mac and those you use only occasionally.
However, Bluetooth connectivity can cause problems when things stop working as expected.
These fixes can help.
Turn off the Bluetooth peripheral and turn it back on.
Confirm the batteries are good or replace old batteries with fresh batteries.
Confirm the Bluetooth peripheral is connected to the Mac.
OpenSystem Preferences>Bluetoothand look for the wordConnectedunder the peripheral in the devices list.
Turn off the Mac’s Bluetooth system.
Wait a minute and turn it back on.
Restart the Mac and the Bluetooth equipment.
Reset NVRAM or PRAM on the Mac.
Delete the Bluetooth preference list.InLibrary>Preferences, locate the file namedcom.apple.Bluetooth.plist.
Delete the Bluetooth.plist file in theLibrary>Preferencesfolder and restart the Mac.
The Library file is hiddenon a Mac by default.
To access it, go toFinder>Go>Go to Folder, enter~/Library, then selectGo.
When the Mac restarts, it creates a new Bluetooth preference file.
Because the preference file is new, you may need to re-pair your Bluetooth peripherals with the Mac.
Use the hidden Bluetooth Debug menu.
To access this menu, press and hold theShiftandOptionkeys and click theBluetooth iconin the Mac menu bar.
choose the equipment that is giving you trouble from the list and chooseFactory Reset.
Reset the Bluetooth module.
If none of these fixes help,contact Apple Supportortake your Mac to the nearest Apple Storefor help.
Sometimes the problem takes place if youupgrade macOSor OS X or change the batteries in the peripheral.
Sometimes, it happens for no apparent reason.
The cause is likely to be a corrupt Bluetooth preference list (.plist file) used by the Mac.
Either of these can lead to problems.
However, other causes exist, and these can almost all be fixed easily.
