Can't log in to macbook pro

Whenever I want to log in my 6 months macbook pro. It will log out. I've tried pram etc and it doesn't works. I also entered safe mode and it won't enter. Help me please, this is the video of my mac problem.

Ok, if still not logging in with shift key held, then we can reinstall or restore from time machine. But there is another solution which will be quicker. Because it's getting to the login screen, and this issue occurs when we try to go into your user, it stands to reason this is a user issue, so putting down a new system is unlikely to resolve it.
If you boot to your install disk and go into "reset password" from the utilities menu. On that screen select your HD and look in the drop down list for... I can't remember off the top of my head, but there aren't many options and it'll most likely say root, maybe master... the one that's not your user anyway. Then enter a password for this and repeat it. What we've done is enable the root user (God mode), so do not mess around in this user unless you've very confident.
Restart the machine, this time select the new "other" icon at the login screen. Username = root, password is whatever you set it to. Can you log in here? If so, navigate to HD/Users/YOUR_USERNAME/Library
In there you'll find a folder called prefer "Launch agents" - rename this folder or move it to the desktop folder in your user.
Try log into your user again, if same, go back to root user.
This time, in the same location, look for a folder called "preferences" - again, rename or move and try login again.
If still the same, same procedure, but this time rename the entire user library and then try login.
We can move these files and folders back - if you put them back in location or rename to original name, it'll be as though we did nothing. When you login it will automatically rebuild these folders, but it will be as though it's a new machine almost - we can get most of it, if not all of it, back though

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