Grey Screen after login- just did OS update

I am using a 15" MacBook Pro, 2011 model. I just got it back with a new hard drive and it was working fine for 3 days, then I applied the latest Mac OS update. The update caused a restart and that is where my problem started. When it restarts, the user logon screen comes up and i enter my user name and password and then hit enter. It accepts it and then a grey screen comes up and just hangs there.
Any ideas?

Jonny b Goode wrote:
When it restarts, the user logon screen comes up and i enter my user name and password and then hit enter. It accepts it and then a grey screen comes up and just hangs there.
If this was a problem with OS X or a thrid party at boot kext file, it likely would show up BEFORE the login screen.
Since it appears after the log in screen, that would suggest it's a problem with a auto-launch of a program after the account is logged into.
This is a new resume feature of OS X Lions and it's a problem obviously because you don't know what program is responsible.
At least with manual launching of programs, if the machine crashes you know what program caused it.
What you do is hold the Shift Key down upon boot, this enters Safe Mode and disables these at launch programs which you then go around and update all your third party software.
Disable the "resume windows" feature in System Preferences or use the free TinkerTool until your problem is resolved.
Apple menu > System Preferences > General >
Uncheck “Restore windows when quitting and re-opening apps“
You can look at the Console > System Diagnostic log file for a clue what program is crashing the machine.
Once you discover what it is, use the developers uninstall method to remove the program if there is no update available.
To be systematic on repairing your machine look at this User Tip,
..Step by Step to fix your Mac
Once we have some idea of what program is causing your machine to crash then it can be replaced with a new copy or sometimes it's the preference file for it has gotten corrupted or a file it's loading and that causes everything to crash once you log in.
If replacing the program with a new copy doesn't fix it, then it's likely it's preference file has gotten corupted and that's not reinstalled fresh when you reinstall the program, it's carried over from the previous install/use of the program.
See Step #12/#13 for details.

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extra/gnome-screenshot 3.10.1-1 -> 3.12.0-1
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extra/gtk2 2.24.22-1 -> 2.24.23-1
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extra/gvfs 1.18.3-3 -> 1.20.1-2
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extra/libimobiledevice 1.1.5-2 -> 1.1.6-1
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extra/gvfs-mtp 1.18.3-3 -> 1.20.1-2
extra/gvfs-smb 1.18.3-3 -> 1.20.1-2
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https://support.apple.com/en-us/HT201559
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If the startup process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 8
Launch Disk Utility in Recovery mode (see Step 1.) Select the startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then restart as usual.
Step 9
Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 10
Do as in Step 9, but this time erase the startup volume in Disk Utility before installing. The system should automatically restart into the Setup Assistant. Follow the prompts to transfer the data from a Time Machine or other backup.
Step 11
This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a startup failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
Step 12
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

Grey Screen after login- just did OS update

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