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.
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