Late 2011 MacBook Pro can't boot after Yosemite install

After installing Yosemite on this late 2011 MacBook Pro it stops about a third of the way into booting up. It displays a null sign. I can boot into recovery disk, or external HD (I don't have a backup of this system, but can boot from my MacBook Air's clone) if I use option-R or just option at startup. It won't go into Safe Mode. From the ext HD I have reinstalled Yosemite on the MBP, but it still freezes mid-boot. Disk Utility repair permissions, repair HD, zap PRAM, SMC, I've tried all of these (from reading advice here, and PM from Ogelthorpe). I have copied the Etre Report below. Suggestions?
EtreCheck version: 2.1.8 (121)
Report generated March 24, 2015 at 2:16:55 PM EDT
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
Hardware Information: ℹ️
    MacBook Pro (13-inch, Late 2011) (Technical Specifications)
    MacBook Pro - model: MacBookPro8,1
    1 2.4 GHz Intel Core i5 CPU: 2-core
    4 GB RAM Upgradeable
        BANK 0/DIMM0
            2 GB DDR3 1333 MHz ok
        BANK 1/DIMM0
            2 GB DDR3 1333 MHz ok
    Bluetooth: Old - Handoff/Airdrop2 not supported
    Wireless:  en1: 802.11 a/b/g/n
    Battery Health: Normal - Cycle count 431
Video Information: ℹ️
    Intel HD Graphics 3000
        Color LCD 1280 x 800
System Software: ℹ️
    OS X 10.10.3 (14D113c) - Time since boot: 0:25:56
Disk Information: ℹ️
    ST9500325ASG disk0 : (500.11 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
        Macintosh HD (disk1) /Volumes/Macintosh HD : 498.88 GB (345.40 GB free)
            Core Storage: disk0s2 499.25 GB Online
    MATSHITADVD-R   UJ-8A8
USB Information: ℹ️
    Apple Inc. FaceTime HD Camera (Built-in)
    Apple Inc. BRCM2070 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Inc. Apple Internal Keyboard / Trackpad
    Western Digital My Book 1140 2 TB
        EFI (disk2s1) <not mounted> : 210 MB
        MBPClone (disk2s2) /Volumes/MBPClone : 249.35 GB (119.30 GB free)
        Recovery HD (disk2s3) <not mounted>  [Recovery]: 784 MB
        Clone27iMac (disk2s4) /Volumes/Clone27iMac : 1.08 TB (918.40 GB free)
        Recovery HD (disk2s5) <not mounted>  [Recovery]: 650 MB
        MediaorWhatever (disk2s6) / : 665.53 GB (583.65 GB free)
        Recovery HD (disk2s7) <not mounted>  [Recovery]: 650 MB
    Apple Computer, Inc. IR Receiver
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
    Mac App Store and identified developers
Kernel Extensions: ℹ️
        /System/Library/Extensions
    [not loaded]    com.ricoh.print.kext.USBPrintClass (3.01) [Click for support]
        /Volumes/MBPClone/Applications/DiskWarrior.app
    [not loaded]    com.alsoft.Preview (4.4) [Click for support]
        /Volumes/MBPClone/Library/Sophos Anti-Virus/InterCheck.app
    [not loaded]    com.sophos.kext.sav (8.0.14 - SDK 10.5) [Click for support]
Launch Agents: ℹ️
    [loaded]    com.google.keystone.agent.plist [Click for support]
    [running]    net.culater.SIMBL.Agent.plist [Click for support]
Launch Daemons: ℹ️
    [loaded]    com.adobe.fpsaud.plist [Click for support]
    [loaded]    com.bombich.ccc.plist [Click for support]
    [running]    com.bombich.ccchelper.plist [Click for support]
    [loaded]    com.google.keystone.daemon.plist [Click for support]
    [loaded]    com.transcend.TSTRIMHandlerHelp.plist [Click for support]
User Launch Agents: ℹ️
    [loaded]    com.adobe.ARM.[...].plist [Click for support]
User Login Items: ℹ️
    iTunesHelper    Application  (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
    WD Quick View    Application  (/Library/Application Support/WDSmartware/WDQuickView.app)
Internet Plug-ins: ℹ️
    o1dbrowserplugin: Version: 5.40.2.0 - SDK 10.8 [Click for support]
    Default Browser: Version: 600 - SDK 10.10
    Flip4Mac WMV Plugin: Version: 2.3.2.6 [Click for support]
    OfficeLiveBrowserPlugin: Version: 12.3.6 [Click for support]
    AdobePDFViewerNPAPI: Version: 10.1.13 [Click for support]
    FlashPlayer-10.6: Version: 16.0.0.305 - SDK 10.6 [Click for support]
    Silverlight: Version: 4.0.50917.0 [Click for support]
    Flash Player: Version: 16.0.0.305 - SDK 10.6 Outdated! Update
    QuickTime Plugin: Version: 7.7.3
    googletalkbrowserplugin: Version: 5.40.2.0 - SDK 10.8 [Click for support]
    iPhotoPhotocast: Version: 7.0 - SDK 10.8
    AdobePDFViewer: Version: 10.1.13 [Click for support]
    Scorch: Version: 6.2.0 [Click for support]
    DirectorShockwave: Version: 12.0.7r148 - SDK 10.6 [Click for support]
3rd Party Preference Panes: ℹ️
    Flash Player  [Click for support]
    Flip4Mac WMV  [Click for support]
    Perian  [Click for support]
    WDQuickView  [Click for support]
Time Machine: ℹ️
    Mobile backups: OFF
    Auto backup: NO - Auto backup turned off
    Volumes being backed up:
    Destinations:
        MBP Backup [Local]
        Total size: 299.73 GB
        Total number of backups: 20
        Oldest backup: 2013-03-14 16:58:24 +0000
        Last backup: 2014-02-25 16:24:25 +0000
        Size of backup disk: Excellent
            Backup size 299.73 GB > (Disk size 0 B X 3)
Top Processes by CPU: ℹ️
         5%    WindowServer
         3%    mds
         0%    AppleSpell
         0%    fontd
         0%    mds_stores
Top Processes by Memory: ℹ️
    249 MB    mds_stores
    150 MB    Finder
    116 MB    Dock
    116 MB    Spotlight
    73 MB    ocspd
Virtual Memory Information: ℹ️
    801 MB    Free RAM
    1.59 GB    Active RAM
    785 MB    Inactive RAM
    1.09 GB    Wired RAM
    2.01 GB    Page-ins
    446 KB    Page-outs
Diagnostics Information: ℹ️
    Mar 24, 2015, 01:44:49 PM    Self test - passed
    Mar 22, 2015, 10:30:37 PM    /Library/Logs/DiagnosticReports/VideoMemoryTool_2015-03-22-223037_[redacted].cr ash

Drive Partition and Format
1. Boot from your Snow Leopard Installer Disc. After the installer loads select your language and click on the Continue button.  When the menu bar appears select Disk Utility from the Utilities menu.
If you are preparing an external or a non-startup drive, then open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area.  If it does not say "Verified" then the drive is failing or has failed and will need replacing.  SMART info will not be reported  on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
7. Quit DU when it is finished and return to the installer. Install Snow Leopard. Download and install Mac OS X 10.6.8 Update Combo v1.1.

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    Download EtreCheck from http://etresoft.com/etrecheck
    Click the [Click for support] links for help with non-Apple products.
    Click the [Click for details] links for more information about that line.
    Hardware Information: ℹ️
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            BANK 1/DIMM0
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        Battery Health: Normal - Cycle count 406
    Video Information: ℹ️
        Intel HD Graphics 3000 - VRAM: 512 MB
        AMD Radeon HD 6750M - VRAM: 512 MB
            Color LCD 1440 x 900
    System Software: ℹ️
        OS X 10.10.2 (14C109) - Time since boot: 0:48:10
    Disk Information: ℹ️
        ST9500325ASG disk0 : (500.11 GB)
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        Dropbox    Application  (/Applications/Dropbox.app)
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        SharePointBrowserPlugin: Version: 14.3.8 - SDK 10.6 [Click for support]
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        Default Browser: Version: 600 - SDK 10.10
    3rd Party Preference Panes: ℹ️
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    Time Machine: ℹ️
        Time Machine not configured!
    Top Processes by CPU: ℹ️
            10%    WindowServer
             5%    Google Chrome
             2%    fontd
             0%    Safari
             0%    launchservicesd
    Top Processes by Memory: ℹ️
        1.07 GB    Safari
        261 MB    Google Chrome
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    Virtual Memory Information: ℹ️
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        4.81 GB    Active RAM
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        1.76 GB    Wired RAM
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        0 B    Page-outs
    Diagnostics Information: ℹ️
        Feb 17, 2015, 09:45:40 AM    /Users/[redacted]/Library/Logs/DiagnosticReports/dynamiclinkmanager_2015-02-17- 094540_[redacted].crash
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        Feb 16, 2015, 06:43:57 PM    /Library/Logs/DiagnosticReports/LegacyFileVaultMessageTracer_2015-02-16-184357_ [redacted].crash
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    Disk Information: ℹ️
        ST9500325ASG disk0 : (500.11 GB)
            EFI (disk0s1) <not mounted> : 210 MB
            Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
            Macintosh HD (disk1) / : 498.88 GB (446.78 GB free)
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    All you have to do is start the install routine and then point the install to an external hard drive. Once the download is finished the computer will reboot to start the install. At that reboot disconnect the external drive so the install can not start. Boot the computer back into the OS on the internal hard drive, which is what will happen automatically once the external drive is disconnected. Then connect the external and copy the files from it that were downloaded. Right click on that downloaded package file and select Show contents. In the contents of that package is a file called InstallESD.DMG. Copy that file out of the package and burn it down to a DVD or USB thumb drive and you now have the Full Lion Installer. I have several of them laying around on different hard drives and 2 USB thumb drives which I have used to reinstall Lion on my 15" MBP.
    Sorry OP I should of just typed this out in my first post.

  • HT201343 Can you AirPlay to an Apple TV with the MacBook closed? I have a late 2011 MacBook Pro.

    Can you AirPlay to an Apple TV with the MacBook closed? I have a late 2011 MacBook Pro.

    If you are using airplay then that should be fine once the content is playing. You can't use home-sharing in this manner however.

  • Can a late 2011 Macbook Pro utilize 1.35v RAM? Can OS X 10.8 display the RAM voltage?

    Can a late 2011 Macbook Pro (Sandy Bridge, not Ivy Bridge) utilize 1.35 volts Ram or will the Pro run it at 1.5 volts? Is there anyway in OS X 10.8 to determine what voltage the RAM is running at?

    Thanks again wjosten.
    Do you know of any third-party software titles that can provide the RAM's voltage? I ask because others have made unsubstantiated claims of using 1.35V ram with a late 2011 MacBook Pro and because Crucial's website suggests the use of 1.35V with a late 2011 MacBook Pro. Unless it is a mistake, I do not know why Crucial would suggest this:
    http://www.crucial.com/store/listparts.aspx?model=MacBook%20Pro%202.5GHz%20Intel %20Quad-Core%20i7%20(15-inch%20DDR3)%20Late-2011

  • Crucial memory co says that you can put 16 g ram memory in the later 2011 macbook pro 17" 2.4 i7 quad core, True?

    crucial memory co says that you can put 16 g ram memory in the later 2011 macbook pro 17" 2.4 i7 quad core, True?
    DDR3 PC3-10600 • CL=9 • Unbuffered • NON-ECC • DDR3-1333 • 1.35V • 1024Meg x 64 •   •  Part #: CT3327381

    nope - no difference than running with 4GB......Apps however, open much faster with 16GB....
    you'll also have 0 page outs and 0 swap used...
    see image...

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