Yosemite stuck on boot screen after attempted disk repair

So I had and old 500Gb laptop hard drive lying around and a sata reader so I figured see if I could make use of a free 500 gigs. I plugged the drive in and it didn't mount so naturally I checked Disk Util. After attempting to mount the disk with no success, I attempted to erase it which resulted in the unable to write to last block error. Finally I figured I'll run repair and see where it gets me. Repair was taking forever so I saved the job for overnight. Before I went to bed I started the repair and let it run. At some point I woke up to a slight click of my entire system shutting down, followed by the startup chime. While concerned I didn't think anything bad would happen so I figured I would wait until morning to simply walk over and log in, but here is w the problems started. When I got to my computer in the morning it was still on the grey boot screen with the apple and the bar. I booted into recovery mode. Succeeded in repairing the external 500 gig drive then checked my Macintosh HD and ran repairs. A few small things were repaired and I expected it to boot fine, but no. I haves restarted many multiple times and given it a while to load, I have reset the p-ram, I have done everything i know how to do. I really need this computer for school, so a quick solution would be great. What happened and how do I avoid this in the future?
Thanks,
Thomas

I rebooted my machine and was back to either getting stuck at 50% or just seeing a black screen. Both times I was using a Kensignton USB 3.0 Multi-Display Adapter as well as the Mini DisplayPort to DVI port. Once I power off (hold 10 second power button), unplug all external monitors, I'm able to boot into the OS.
Currently running DisplayLink USB Graphics Software for Mac OS X version 2.3 Beta
http://www.displaylink.com/support/mac_downloads.php

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Yosemite stuck on boot screen - Possible M4 SSD issue

I had OS X Mavericks prior to installing OS X 10.10 Yosemite. I downloaded Yosemite through the App Store on to a mid-2012 Macbook Pro 13 in.
Model Name:    MacBook Pro
Model Identifier:    MacBookPro9,2
Processor Name:    Intel Core i5
Processor Speed:    2.5 GHz
Number of Processors:    1
Total Number of Cores:    2
L2 Cache (per Core):    256 KB
L3 Cache:    3 MB
Memory:    Crucial 16 GB 1333 MHz DDR3
Boot ROM Version:    MBP91.00D3.B09
SMC Version (system):    2.2f44
Sudden Motion Sensor:
State:    Enabled
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I rebooted into OSX recovery system (Option-R during bootup) and was going to reinstall OSX Yosemite. After unlocking the boot drive, entering in my Apple account info, it said it was going to take a few hours to redownload and install. I stopped it 5 minutes into the download and rebooted the Mac using the OSX recovery system exit > reboot method. Luck would have it, I was able to login and complete the install. I updated all the applications to the latest version (outside of the App Store), such as Adobe, Silverlight, etc.., missed this step prior to installed Yosemite. Everything was working fine.
During normal work, I had a lot of applications open from VMware Fusion, Office for Mac, Firefox, and then when I opened Preview, the Mac crashed with the grey screen of death. When I rebooted by holding down the power button for 10 seconds, it would only let me unlock the drive and was stuck loading up to 50% without ever getting past the progress screen for 30 minutes. I went back to OSX Recovery System and performed the reinstall OSX Yosemite and backed out again as I did before thinking it would let me log in. After rebooting it failed to get past 50%. The next reboot I was able to login.
I started thinking about the 256GB M4 SSD Firmware and noticed on the http://www.crucial.com/usa/en/support-ssd-firmware it stated upgrading from 040H (what I was on) to 070H would fix the following issues. Granted it stated for Windows and not Mac, after updating the firmware, I have been shutting down and rebooting without issue (crossing fingers).
The following is a summary of changes between 040H and 070H, which are independent of operating system:
Resolved a power-up timing issue that could result in a drive hang, resulting in an inability to communicate with the host computer. The hang condition would typically occur during power-up or resume from Sleep or Hibernate. Most often, a new power cycle will clear the condition and allow normal operations to continue. The failure mode has only been observed in factory test. The failure mode is believed to have been contained to the factory. This fix is being implemented for all new builds, for all form factors, as a precautionary measure. The fix may be implemented in the field, as desired, to prevent occurrence of this boot-time failure. To date, no known field returns have been shown to be related to this issue. A failure of this type would typically be recoverable by a system reset.
I upgraded the current Mac to a Crucial M4 256GB SSD and moved the stock 750GB hard drive to the cd-rom bay. I was able to install the update to 070H using an bootable USB stick and the method from http://forum.crucial.com/t5/Crucial-SSDs/Updating-firmware-on-Macs-without-a-sup erdrive/td-p/61259. I did have to disconnect the second drive (just lifted the connector to the motherboard) as it would not allow the Firmware update to start with the drive connected.
Seeing if this helps anyone else out with Yosemite locking up during a boot. I did not enable TRIM as I read it can hurt the M4 SSD since it has a garbage collection.
M4-CT256M4SSD2:
Capacity:    256.06 GB (256,060,514,304 bytes)
Model:    M4-CT256M4SSD2
Revision:    070H
Native Command Queuing:    Yes
Queue Depth:    32
Removable Media:    No
Detachable Drive:    No
BSD Name:    disk0
Medium Type:    Solid State
TRIM Support:    No
Partition Map Type:    GPT (GUID Partition Table)
S.M.A.R.T. status:    Verified

I rebooted my machine and was back to either getting stuck at 50% or just seeing a black screen. Both times I was using a Kensignton USB 3.0 Multi-Display Adapter as well as the Mini DisplayPort to DVI port. Once I power off (hold 10 second power button), unplug all external monitors, I'm able to boot into the OS.
Currently running DisplayLink USB Graphics Software for Mac OS X version 2.3 Beta
http://www.displaylink.com/support/mac_downloads.php

Iphone is stuck on boot screen after new IOS6 update

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Ummmm.... there is nothing to recover.
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Also, if the device had been used as designed, all your contacts, notes, calendar entries, etc would be synced with a supported application on the computer or a cloud service. While this would not eliminated the possibility of data loss, it would certainly minimize the data lost.

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MacBook Pro stuck at grey screen after Yosemite upgrade

upgraded to yosemite yesterday. Reboot and stuck at grey screen(login in page) when i log in there is some codes thing at the left top corner of the screen. and then it reboots again. Which means I can never log onto the computer. what should I do

If you can't start up and log in in the usual way, try in safe mode.
During startup, you’ll see a progress bar, and then the login screen, which appears even if you normally log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Log in as an administrator to carry out these instructions. If you have only one account, you are the administrator.
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I know the report is long, maybe several hundred lines. Please post all of it anyway.
In the interest of privacy, I suggest that, before posting, you edit out the “Anonymous UUID,” a long string of letters, numbers, and dashes in the header of the report, if it’s present (it may not be.)
Please don’t post other kinds of diagnostic report.

Yosemite stuck on boot screen after attempted disk repair

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