In the meantime, always make sure your startup disk is selected in system preferences and then do this procedure every no and then:
This article proposes two actions:
Clear the dynamic loader shared cache by booting one time is Safe mode.
Rebuild Kernel Extension Caches with a few terminal commands.
The whole process will take you approximately 4 to 5 minutes to perform if that.
Step 1 : Clear the dynamic loader shared cache
So First: boot in safe mode by restarting your mac by holding the SHIFT key immediately after hearing the boot chime. When you reach the login window, don’t even log in, just hit restart.
Step 2 : Rebuild Kernel Extension Caches
Open a terminal window and type the following commands:
sudo chown root:admin /
(the system will ask your password to grant access to the sudo chown command as this requires admin privileges)
sudo kextcache -system-prelinked-kernel
sudo kextcache -system-caches
Then restart.
This article proposes two actions:
Clear the dynamic loader shared cache by booting one time is Safe mode.
Rebuild Kernel Extension Caches with a few terminal commands.
The whole process will take you approximately 4 to 5 minutes to perform if that.
Step 1 : Clear the dynamic loader shared cache
So First: boot in safe mode by restarting your mac by holding the SHIFT key immediately after hearing the boot chime. When you reach the login window, don’t even log in, just hit restart.
Step 2 : Rebuild Kernel Extension Caches
Open a terminal window and type the following commands:
sudo chown root:admin /
(the system will ask your password to grant access to the sudo chown command as this requires admin privileges)
sudo kextcache -system-prelinked-kernel
sudo kextcache -system-caches
Then restart.