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After the Apple logo appears, it might take longer than usual to reach the login screen or your desktop. This is because your Mac performs a directory check of your startup disk as part of safe mode.
If this works enter your password.
Then go click on Apple Menu -->Preferences• Then go into Accounts• For your Login account under Login Items• Remove all login items• once you have completed that, close the window.
Next place you need to go:• Click on Macintosh HD icon• Click on System Folder--> Library• From Library select and open StartupItems folder.• Remove all Startup Items to Trash.• Close windows and reboot up normally.
Let me know the results and we can go from there. Please attempt safe mode a couple of times to be sure.
Shut down your Mac.Locate the following keys on the keyboard: Command (⌘), Option, P, and R.Turn on your Mac.Press and hold the Command-Option-P-R keys immediately after you hear the startup sound.Hold these keys until the computer restarts and you hear the startup sound for a second time.Release the keys.
If this doesnt work, then try this method:
reset the SMC on Mac notebook computers
First determine whether the battery is removable. Mac notebook computers that have a nonremovable battery include MacBook Pro (Early 2009) and later, all models of MacBook Air, MacBook (Late 2009), and MacBook (Retina, 12-inch, Early 2015).
If the battery is nonremovable
If the battery is removable
The LED on MagSafe power adapters might change states or temporarily turn off when you reset the SMC.
Let me know what happens.