irratic behaviour while booting up
my mac book air some time does not boot up flashes the folder with the question mark and then at time boots up without an issue ... whats up?
MacBook Air (13-inch Mid 2013), OS X El Capitan (10.11.6)
Slow startup?
Reset NVRAM/PRAM. http://support.apple.com/kb/PH18761
Reset SMC. Choose the method for “If the battery is non-removable”.
https://support.apple.com/en-us/HT201295
Startup in Safe Mode.
https://support.apple.com/kb/PH21875?locale=en_US
Select Macintosh HD as the Startup Disk.
“Set the default startup disk” http://support.apple.com/kb/HT1310