Stuck at startup and can't log in with valid password

Hi,
I have a MBP late 2011 and can't get past the startup screen with my valid password. After inputting my password the screen flashes and prompts me to input my password again (the password bar does not shake). If I go into safe mode, the same thing occurs. Note that I have no guest account either. I've tried PRAM reset and repaired disk via Disk Utlilty. I've also tried /sbin/fsck -fy. I have no installation CD either. Is there any other options I could try?
Before this happened, I tried to plug in my HDMI to my external monitor but got a random grey screen I couldn't avoid. After many hard resets I'm faced with this problem.
Thanks

The lack of a backup history makes this problem very hard to solve.
Erase and install OS X. This operation will destroy all data on the startup volume, so you had be better be sure of the backups. If you upgraded from an older version of OS X, you'll need the Apple ID and password that you used.
When you restart, you'll be prompted to go through the initial setup process in Setup Assistant. That’s when you transfer the data from a backup.
Select only users and Computer & Network Settings in the Setup Assistant dialog—not Applications or Other files and folders. Don't transfer the Guest account, if it was enabled.
After that, run Software Update.
If the problem is resolved after the clean installation, reinstall third-party software selectively. I can only suggest general guidelines. Self-contained applications that install into the Applications folder by drag-and-drop or download from the App Store are usually safe. Anything that comes packaged as an installer or that prompts for an administrator password is suspect, and you must test thoroughly after reinstalling each such item to make sure you haven't restored the problem.
I strongly recommend that you never reinstall commercial "security" products or "utilities," nor any software that changes the user interface or the behavior of built-in applications such as Safari. If you do that, the problem is likely to recur.
Before installing any software, ask yourself the question: "Am I sure I know how to uninstall this without having to wipe the volume again?" If the answer is "no," stop.
Never install any third-party software unless you know how to uninstall it.

Similar Messages

  • Can't log in with valid password, can't boot from disk, can't access disk utility, in single user mode can't reset password as appears locked in caps mode with '?' for forward slash, can anyone help?

    Can't log in with valid password, can't boot from disk, can't access disk utility, in single user mode can't reset password as appears locked in caps mode with '?' for forward slash, can anyone help?

    Which keyboard layout you were using? German, French ... I suppose your layout is reset to the default: US and you are unable to find the "?" or "/" ...
    Please have a look into the keyboard viewer, to see how the layout of your keyboard is actually.
    marek

  • HT1689 I changed my apple I'd and password but my old I'd keeps coming up and I can't log in with new password

    I have an iPad.  Couldn't remember password do I changed user name and password.  How do I get the old user name to stop popping up when I want to sign in for a purchase at iTunes?

    Did you create a new account or did you update your existing account ? You can log out of the currently logged in account by tapping on the id in Settings > Store (Settings > iTunes & App Stores on iOS 6) and you can then log back in. If you created a new account then your existing purchases will remain tied to your old account.

  • Log In Error "Can't log in" with my password - Win...

    I log in to my microsoft account on Windows 8, usually Skype will just automatically connect.  Recently it will say "can't sign in, please type in your password" and it pops up my microsoft account information as log in name and then I type in the SAME exact password I just used seconds ago to sign into my computer and it says "can't sign in."  Then I have to go to live.login and change my password.  I have done this more than a handful of times in the past month.  It happens on my computer and also on my phone.  
    As soon as I change my password, I go to my skype, type it in, and it works fine.  I am pretty sure the problem is with Skype and not my microsoft account because I can still log in to my computer and my hotmail just fine.
    I am tired of having to change my password all of the time!! It happens at least once a week.  It is particularly annoying, say, when on my lunch break I would like to just call my boyfriend overseas, but since skype can't recognize my password (even though it hasn't been changed and it is usually always automatically connected) I have to go to change my password (which includes me accessing an alternative email and typing in a code and blah bla hblah" from my phone.  
    WHAT GIVES ????

    Have you enabled the optional "two-step verification" login option?
    http://blogs.microsoft.com/blog/2013/04/17/microsoft-account-gets-more-secure/

  • Can't log in with my password

    A week ago I wan unable to log into my computer becuase the password would no longer work.  I know I might be entering the wrong password, but I was locked out in three different places and i was able to change the password there.  Please help! How can I update my systems preferrences password on the MacBook pro?

    https://discussions.apple.com/docs/DOC-4101

  • Upgraded ios 5 and can't log in with apple ID to set up.

    HELP

    After downloading ios 5 & everything was restored on my iphone 4, I needed to complete a few steps to have regular access to the phone; steps such as enabling service locations, joining a wi-fi network and signing in with my apple ID. However I know I'm using the correct ID & password but it won't sign in and I usually wait until connection times out.
    I'm kinda stuck here.

  • HT1349 after updating the OS today on my iphone 4S I activated  the lock my phone with the password. Now  when I truned on the phone it is locked and can not unlock it with the password.

    after updating the OS on my iphone 4S   i activated the lock my phone  and now I can not unlock it it put the password in but it does not work how can I unlock it?

    Hello son29660,
    Thanks for using Apple Support Communities.
    For more information on this, take a look at:
    iOS: Forgotten passcode or device disabled after entering wrong passcode
    http://support.apple.com/kb/ht1212
    Best of luck,
    Mario

  • My ipod is getting stuck on startup and i cannot even access the recovery mode. what can i do to resolve this problem?

    Hi.
    My ipod touch 5 is getting stuck on startup and i cannot even access the recovery mode.
    what should i do to resolve this problem?

    Try what you missed here:                                               
    - iOS: Not responding or does not turn on           
    - Also try DFU mode after try recovery mode
    How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
    - If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
    - Try another cable                     
    - Try on another computer                                                       
    - If still not successful that usually indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
      Apple Retail Store - Genius Bar                              

  • I can't remember my mac mini password and can only log in under test, please help

    I can't remeber my Mac mini password and can only log in under Test.  Please help me as I would like to access my photos and personal information.  Thanks

    Forgot Your Account Password
    For Snow Leopard and earlier
         Mac OS X 10.6- If you forget your administrator password
    For Lion/Mountain Lion
        Boot to the Recovery HD:
    Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
         When the menubar appears select Terminal from the Utilities menu.
         Enter resetpassword at the prompt and press RETURN. Follow
         instructions in the dialog window that will appear.
         Or see Reset a Mac OS X 10.7 Lion Password and
         OS X Lion- Apple ID can be used to reset your user account password.
    If you cannot do the above then try this:
      1. Boot to Safe Mode by restarting and after the chime press and hold down the COMMAND-S keys until a black screen with white type appears.
      2. At the prompt, type the following commands pressing return after each command line:
         /sbin/fsck -yf
         If you do not receive a "Filesystem OK" message then repeat this command until
         you do.  If after seven tries you still do not receive a "Filesystem OK" message,
         then the system is corrupted and needs to be reinstalled.
         mount -uw /
         cd /private/var/db/netinfo
         mv local.nidb local.old
         rm ../.AppleSetupDone
         shutdown -r now
    The second-to-last command above will cause OS X to think that the operating system is newly installed, and when the new owner starts up the computer it will send him/her to the startup wizard where he/she can start a new user without reinstalling.
    This last method does not actually change a password. It simply removes the user accounts and lets you create an initial admin account as if the computer were new out of the box.
    How to reset the OS X password without a startup CD:
    Reboot into Single-user Mode. Enter the following and press RETURN after each command line
       1. Type fsck -fy
       2. Type mount -uw /
       3. Type passwd <username>
    I have never tried this method myself.

  • I know my Game Center username and password, but I don't know the email (or maybe apple id) that is for my account. It is not my normal one. I can't log in with just my username, so does anyone know how I can get my email?

    I know my Game Center username and password, but I don't know the email (or maybe apple id) that is for my account. It is not my normal one. I can't log in with just my username, so does anyone know how I can get my email?
    Can you help me please

    Dear
    I have worked renovation of the device and have an account, but I forgot my email
    I do not know E-mail has been linked in game center
    I have a name defined in game center
    Do I have the possibility of knowing E-mail has been linked in game center

  • I am from Bangladesh. I can't log in with my gmail Apple ID. When I put in the mail and password, and press sign in, it says it has to review on iTunes. Then I am directed to opening a new account. But why should I , since I have one. Plz help :(

    I am from Bangladesh. I can't log in with my gmail Apple ID. When I put in the mail and password, and press sign in, it says it has to review on iTunes. Then I am directed to opening a new account. But why should I , since I have one. Plz help

    Hi Ishrak,
    I apologize, I'm a bit unclear on exactly what you are trying to log into with your Apple ID, or what exactly you are seeing (alert message, directions, etc) when you try to do so. If you continue to have issues with your Apple ID, you may find one or more of the articles linked from the following page helpful:
    Apple ID - Apple Support
    Regards,
    - Brenden

  • Just bought the ipad4 and can't log into facebook. Times out and tells me to check my network connection. Anyone having the same problem or any ideas?

    Just bought the ipad4 and can't log into facebook. Times out and tells me to check my network connection. Anyone having the same problem or any ideas?

    Hey barnsieno10,
    Thanks for using Apple Support Communities.
    Looks like sign in issue, This article is a great resource for the message you are receiving.
    FaceTime, Game Center, Messages: Troubleshooting sign in issues
    http://support.apple.com/kb/ts3970
    Have a nice day,
    Mario

  • I set up a new user on my network today and am now in a location without access to that network. I just set her up as a user on her macbook but I can't log in with her credentials. Is that because I am not on the network and it is the initial setup?

    I set up a new user on my network today and am now in a location without access to that network. I just set her up as a user on her macbook but I can't log in with her credentials. Is that because I am not on the network and it is the initial setup?

    You need to set the option to create a mobile account using the Directory Utility app. 

  • I upgraded my operating system to OS X Mountain Lion into my computer and now I cannot log in with my password.  How can I get into my computer?

    I upgraded my operating system to OS X Mountain Lion into my computer and now I cannot log in with my password.  How can I get into my computer?

    You will find directions here: https://discussions.apple.com/docs/DOC-4101

  • TS1424 itunes purchase security questions & answers reset and answered correctly.  Can not log in with updated answers which state one or both are incorrect.

    Can anyone help with this situation?
    itunes purchase security questions & answers reset and answered correctly.  Can not log in with updated answers which state one or both are incorrect.

    You need to contact Apple to get the questions reset. Click here, phone them, and ask for the Account Security team, or fill out and submit this form.
    (94948)

Maybe you are looking for