Monitor goes black after apple logo startup

My family gave me a macbook pro 15 inch laptop. they bought it back in aug 2007. Everything has worked fine they told me until my sister had gotten into a small fender bender. But it was enough to send the laptop flying into some stuff in the back of the car, and dent the bottom of it. the problem is that the lap top starts up with gray screen and apple logo, then goes black, but the computer is still running. Also, if i hook it up to a external monitor, it works perfectly, as in it shows up on the external monitor. the dent is located on the botoom right hand corner if your looking at the computer head on. Also the computer gets hotter than usual. Any ideas on how to fix it? I'm a PC guy usually but would like to delve into macs also, so i would like to get this working. I'm running lepoard snow. Thats all i really know about it, any suggestions? I took it into the apple store and they said the logic board could be shorting out because of the aluminum hitting the logic board where the dent is. but if that was true, why would i get a display in the first place? any ideas.
Thank you for suggesting anyting, because it would help.

Welcome to Apple Discussions!
There are a couple of sites with teardown instructions:
http://www.ifixit.com/
http://www.powerbookmedic.com/
Both of these sites also have some troubleshooting tips.
If it were mine, I'd take it apart and straighten out the bent metal. Also check the internal cable connections--it's possible the flex cables to the display may need to be reseated. The connections to an external display are different from the connections to the built in display, so the external could work even if the internal one did not.
It actually sounds like it survived the crash pretty well since it still boots up and runs. The shock may have dislodged some cables, and you need to check and see if the fans are working. You can download a widget from the Apple site called "iStatPro" which will display fan speeds and temperatures.
Did you get the system discs? If so, you may be able to boot to the Apple Hardware Test. If you can, run the extended version and see if you get any error codes. Not sure if you can run it using an external monitor, but it may be worth a try.
Post back if you have any questions. Good luck!

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    com.apple.driver.AppleIntelMeromProfile   19
    com.apple.driver.AirPortBrcm43224  428.42.4
    com.apple.driver.ACPI_SMC_PlatformPlugin     4.7.0a1
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    com.apple.driver.AppleProfileTimestampAction  10
    com.apple.driver.AppleProfileThreadInfoAction  14
    com.apple.driver.AppleProfileRegisterStateAction      10
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    com.apple.iokit.IOSurface 74.2
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    com.apple.driver.AppleSMBusController    1.0.10d0
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    com.apple.kext.ATISupport       6.3.6
    com.apple.iokit.AppleProfileFamily     41
    com.apple.driver.AppleHDAController        2.0.5f14
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    com.apple.iokit.IOHDAFamily    2.0.5f14
    com.apple.iokit.IO80211Family  320.1
    com.apple.driver.AppleSMC      3.1.0d5
    com.apple.driver.IOPlatformPluginFamily   4.7.0a1
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    com.apple.driver.AppleUSBComposite       3.9.0
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    com.apple.iokit.IOBDStorageFamily   1.6
    com.apple.iokit.IODVDStorageFamily        1.6
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    com.apple.iokit.IOUSBUserClient      4.2.4
    com.apple.iokit.IOAHCISerialATAPI   1.2.6
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    com.apple.iokit.IOSCSIParallelFamily        2.1.1
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    com.apple.driver.AppleEFIRuntime    1.4.0
    com.apple.iokit.IOHIDFamily     1.6.6
    com.apple.iokit.IOSMBusFamily        1.1
    com.apple.security.TMSafetyNet       6
    com.apple.kext.AppleMatch      1.0.0d1
    com.apple.driver.DiskImages    289
    com.apple.iokit.IOStorageFamily       1.6.3
    com.apple.driver.AppleACPIPlatform 1.3.6
    com.apple.iokit.IOPCIFamily     2.6.5
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    4   libSystem.B.dylib                 0x00007fff87aafc08 _pthread_wqthread + 353
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    1   libSystem.B.dylib                 0x00007fff87aafe3c _pthread_wqthread + 917
    2   libSystem.B.dylib                 0x00007fff87aafaa5 start_wqthread + 13
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    2   com.steinberg.cubase                  0x00000001007c8be0 0x100000000 + 8162272
    3   com.steinberg.cubase                  0x00000001014f8eb0 CSOLOISTExtendedAnalysis::~CSOLOISTExtendedAnalysis() + 3281296
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    1   libSystem.B.dylib                 0x00007fff87aafe3c _pthread_wqthread + 917
    2   libSystem.B.dylib                 0x00007fff87aafaa5 start_wqthread + 13
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    0   libSystem.B.dylib                 0x00007fff87a95dda semaphore_timedwait_signal_trap + 10
    1   libSystem.B.dylib                 0x00007fff87ad4772 _pthread_cond_wait + 1015
    2   com.apple.CoreVideo                   0x00007fff82fbade6 CVDisplayLink::waitUntil(unsigned long long) + 252
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       r8: 0x0000000000000000   r9: 0x00007fff8abcf420  r10: 0x0000000000000000  r11: 0x00007fff8abcf420
      r12: 0x00000001224521e0  r13: 0x00000001211f4000  r14: 0x000000012473fd9f  r15: 0x00007fff5fbfdcf0
      rip: 0x000000012473fd9f  rfl: 0x0000000000010212  cr2: 0x000000012473fd9f
    Binary Images:
           0x100000000 -        0x1022a4fe7 +com.steinberg.cubase 6.0.7.364 (6.0.7.364) <CFFF5ABF-970D-896D-4A88-78FFF87878C1> /Applications/Cubase 6.app/Contents/MacOS/Cubase 6
           0x10268c000 -        0x1026dcff7  com.apple.audio.midi.CoreMIDI 1.7.1 (42) <E7DBCE93-A637-ABA2-B623-6A76B82EE243> /System/Library/Frameworks/CoreMIDI.framework/Versions/A/CoreMIDI
           0x102704000 -        0x10270aff7  com.apple.agl 3.0.12 (AGL-3.0.12) <014CA38F-CB49-8214-4C16-DF73FC6EFCE1> /System/Library/Frameworks/AGL.framework/Versions/A/AGL
           0x105f00000 -        0x105f89ff2 +com.eLicenser.POSAccess-DLL ??? (1.12.1.0) <66A02345-5109-F38C-1262-D00D8189324C> /Library/Application Support/eLicenser/pos/Synsoacc.bundle/Contents/MacOS/Synsoacc
           0x1170a6000 -        0x1170ccfff  GLRendererFloat ??? (???) <38621D22-8F49-F937-851B-E21BD49A8A88> /System/Library/Frameworks/OpenGL.framework/Resources/GLRendererFloat.bundle/GL RendererFloat
           0x11a17a000 -        0x11a30dfe7  GLEngine ??? (???) <BCE83654-81EC-D231-ED6E-1DD449B891F2> /System/Library/Frameworks/OpenGL.framework/Resources/GLEngine.bundle/GLEngine
           0x11a33e000 -        0x11a730fff  com.apple.ATIRadeonX3000GLDriver 1.6.36 (6.3.6) <282E53E2-ABB3-B97D-F298-6A8FE21F3A5A> /System/Library/Extensions/ATIRadeonX3000GLDriver.bundle/Contents/MacOS/ATIRade onX3000GLDriver
           0x11b243000 -        0x11b249fe7  libFontStreams.A.dylib 545.0.0 (compatibility 64.0.0) <87272933-FB21-81D0-00E6-92BC3D7583FB> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ CoreGraphics.framework/Versions/A/Resources/libFontStreams.A.dylib
           0x1211f4000 -        0x121303fff +com.steinberg.omffilter 4.0.0.179 (4.0.0.179) <C05588E9-6173-ECEF-2BF1-92AE05B78913> /Applications/Cubase 6.app/Contents/Components/omffilter.bundle/Contents/MacOS/omffilter
        0x7fff5fc00000 -     0x7fff5fc3bdef  dyld 132.1 (???) <69130DA3-7CB3-54C8-ABC5-423DECDD2AF7> /usr/lib/dyld
        0x7fff80003000 -     0x7fff80059fe7  libTIFF.dylib ??? (???) <2DBEC120-DAA7-3789-36A2-A205BCDF2D72> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ ImageIO.framework/Versions/A/Resources/libTIFF.dylib
        0x7fff8008f000 -     0x7fff8011ffff  com.apple.SearchKit 1.3.0 (1.3.0) <4175DC31-1506-228A-08FD-C704AC9DF642> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/SearchK it.framework/Versions/A/SearchKit
        0x7fff80132000 -     0x7fff80179ff7  com.apple.coreui 2 (114) <923E33CC-83FC-7D35-5603-FB8F348EE34B> /System/Library/PrivateFrameworks/CoreUI.framework/Versions/A/CoreUI
        0x7fff80453000 -     0x7fff8048dfff  libcups.2.dylib 2.8.0 (compatibility 2.0.0) <4F2A4397-89BD-DEAC-4971-EE838FFA0964> /usr/lib/libcups.2.dylib
        0x7fff80c2c000 -     0x7fff81626ff7  com.apple.AppKit 6.6.8 (1038.36) <4CFBE04C-8FB3-B0EA-8DDB-7E7D10E9D251> /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
        0x7fff81627000 -     0x7fff816dcfe7  com.apple.ink.framework 1.3.3 (107) <8C36373C-5473-3A6A-4972-BC29D504250F> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Ink.framework /Versions/A/Ink
        0x7fff8189e000 -     0x7fff81938fff  com.apple.ApplicationServices.ATS 275.19 (???) <2DE8987F-4563-4D8E-45C3-2F6F786E120D> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ ATS.framework/Versions/A/ATS
        0x7fff8199c000 -     0x7fff81c1efff  com.apple.Foundation 6.6.8 (751.63) <E10E4DB4-9D5E-54A8-3FB6-2A82426066E4> /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation
        0x7fff81c1f000 -     0x7fff81c1fff7  com.apple.Carbon 150 (152) <C0E61968-57F3-6EE1-8524-32A18955BAF0> /System/Library/Frameworks/Carbon.framework/Versions/A/Carbon
        0x7fff81c20000 -     0x7fff81c26ff7  com.apple.CommerceCore 1.0 (9.1) <3691E9BA-BCF4-98C7-EFEC-78DA6825004E> /System/Library/PrivateFrameworks/CommerceKit.framework/Versions/A/Frameworks/C ommerceCore.framework/Versions/A/CommerceCore
        0x7fff81c7f000 -     0x7fff81c8cfe7  libCSync.A.dylib 545.0.0 (compatibility 64.0.0) <1C35FA50-9C70-48DC-9E8D-2054F7A266B1> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ CoreGraphics.framework/Versions/A/Resources/libCSync.A.dylib
        0x7fff81c8d000 -     0x7fff82196ff7  com.apple.RawCamera.bundle 3.14.0 (646) <75A96BFC-1832-808B-F430-C4C9379C5A98> /System/Library/CoreServices/RawCamera.bundle/Contents/MacOS/RawCamera
        0x7fff82197000 -     0x7fff821ecff7  com.apple.framework.familycontrols 2.0.2 (2020) <F09541B6-5E28-1C01-C1AE-F6A2508670C7> /System/Library/PrivateFrameworks/FamilyControls.framework/Versions/A/FamilyCon trols
        0x7fff821ed000 -     0x7fff821f1ff7  libCGXType.A.dylib 545.0.0 (compatibility 64.0.0) <DB710299-B4D9-3714-66F7-5D2964DE585B> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ CoreGraphics.framework/Versions/A/Resources/libCGXType.A.dylib
        0x7fff821f4000 -     0x7fff8236bfe7  com.apple.CoreFoundation 6.6.6 (550.44) <BB4E5158-E47A-39D3-2561-96CB49FA82D4> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
        0x7fff823b7000 -     0x7fff82482fff  ColorSyncDeprecated.dylib 4.6.0 (compatibility 1.0.0) <86982FBB-B224-CBDA-A9AD-8EE97BDB8681> /System/Library/Frameworks/ApplicationServices.framework/Frameworks/ColorSync.f ramework/Versions/A/Resources/ColorSyncDeprecated.dylib
        0x7fff82483000 -     0x7fff824c1fe7  libFontRegistry.dylib ??? (???) <395D7C0D-36B5-B353-0DC8-51ABC0B1C030> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ ATS.framework/Versions/A/Resources/libFontRegistry.dylib
        0x7fff824c2000 -     0x7fff82681fff  com.apple.ImageIO.framework 3.0.6 (3.0.6) <92882FD3-CB3F-D0BE-DDDA-43B4BEE10F58> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ ImageIO.framework/Versions/A/ImageIO
        0x7fff82682000 -     0x7fff82686ff7  libmathCommon.A.dylib 315.0.0 (compatibility 1.0.0) <95718673-FEEE-B6ED-B127-BCDBDB60D4E5> /usr/lib/system/libmathCommon.A.dylib
        0x7fff82687000 -     0x7fff82687ff7  com.apple.Accelerate 1.6 (Accelerate 1.6) <15DF8B4A-96B2-CB4E-368D-DEC7DF6B62BB> /System/Library/Frameworks/Accelerate.framework/Versions/A/Accelerate
        0x7fff82688000 -     0x7fff82745fff  com.apple.CoreServices.OSServices 359.2 (359.2) <BBB8888E-18DE-5D09-3C3A-F4C029EC7886> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/OSServi ces.framework/Versions/A/OSServices
        0x7fff82746000 -     0x7fff82747ff7  com.apple.audio.units.AudioUnit 1.6.7 (1.6.7) <49B723D1-85F8-F86C-2331-F586C56D68AF> /System/Library/Frameworks/AudioUnit.framework/Versions/A/AudioUnit
        0x7fff827c6000 -     0x7fff827d7ff7  libz.1.dylib 1.2.3 (compatibility 1.0.0) <97019C74-161A-3488-41EC-A6CA8738418C> /usr/lib/libz.1.dylib
        0x7fff827d8000 -     0x7fff82842fe7  libvMisc.dylib 268.0.1 (compatibility 1.0.0) <AF0EA96D-000F-8C12-B952-CB7E00566E08> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.fr amework/Versions/A/libvMisc.dylib
        0x7fff82843000 -     0x7fff82959ff7  libxml2.2.dylib 10.3.0 (compatibility 10.0.0) <3814FCF9-92B9-A6AB-E76A-F7021894AA3F> /usr/lib/libxml2.2.dylib
        0x7fff82cad000 -     0x7fff82ccdfff  com.apple.DirectoryService.Framework 3.6 (621.16) <0ED4A74A-F8FB-366D-6588-F13EA397326F> /System/Library/Frameworks/DirectoryService.framework/Versions/A/DirectoryServi ce
        0x7fff82da6000 -     0x7fff82e24ff7  com.apple.CoreText 151.13 (???) <5C6214AD-D683-80A8-86EB-328C99B75322> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ CoreText.framework/Versions/A/CoreText
        0x7fff82e25000 -     0x7fff82f5afff  com.apple.audio.toolbox.AudioToolbox 1.6.7 (1.6.7) <F4814A13-E557-59AF-30FF-E62929367933> /System/Library/Frameworks/AudioToolbox.framework/Versions/A/AudioToolbox
        0x7fff82fb5000 -     0x7fff82fb7fff  com.apple.print.framework.Print 6.1 (237.1) <CA8564FB-B366-7413-B12E-9892DA3C6157> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Print.framewo rk/Versions/A/Print
        0x7fff82fb8000 -     0x7fff82fddff7  com.apple.CoreVideo 1.6.2 (45.6) <E138C8E7-3CB6-55A9-0A2C-B73FE63EA288> /System/Library/Frameworks/CoreVideo.framework/Versions/A/CoreVideo
        0x7fff82fde000 -     0x7fff8311cfff  com.apple.CoreData 102.1 (251) <9DFE798D-AA52-6A9A-924A-DA73CB94D81A> /System/Library/Frameworks/CoreData.framework/Versions/A/CoreData
        0x7fff8311d000 -     0x7fff831cdfff  edu.mit.Kerberos 6.5.11 (6.5.11) <085D80F5-C9DC-E252-C21B-03295E660C91> /System/Library/Frameworks/Kerberos.framework/Versions/A/Kerberos
        0x7fff831ce000 -     0x7fff8328ffef  com.apple.ColorSync 4.6.8 (4.6.8) <7DF1D175-6451-51A2-DBBF-40FCA78C0D2C> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ ColorSync.framework/Versions/A/ColorSync
        0x7fff832c0000 -     0x7fff8339dfff  com.apple.vImage 4.1 (4.1) <C3F44AA9-6F71-0684-2686-D3BBC903F020> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vImage.fr amework/Versions/A/vImage
        0x7fff8339e000 -     0x7fff8339eff7  com.apple.vecLib 3.6 (vecLib 3.6) <96FB6BAD-5568-C4E0-6FA7-02791A58B584> /System/Library/Frameworks/vecLib.framework/Versions/A/vecLib
        0x7fff8339f000 -     0x7fff8369dfff  com.apple.HIToolbox 1.6.5 (???) <AD1C18F6-51CB-7E39-35DD-F16B1EB978A8> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.fra mework/Versions/A/HIToolbox
        0x7fff8369e000 -     0x7fff836c0ff7  libexpat.1.dylib 7.2.0 (compatibility 7.0.0) <8EC31253-B585-D05E-F35D-AE3292FB790B> /usr/lib/libexpat.1.dylib
        0x7fff83722000 -     0x7fff8376bfef  libGLU.dylib ??? (???) <B0F4CA55-445F-E901-0FCF-47B3B4BAE6E2> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLU.dylib
        0x7fff8376c000 -     0x7fff83851fef  com.apple.DesktopServices 1.5.11 (1.5.11) <39FAA3D2-6863-B5AB-AED9-92D878EA2438> /System/Library/PrivateFrameworks/DesktopServicesPriv.framework/Versions/A/Desk topServicesPriv
        0x7fff8389f000 -     0x7fff838e2ff7  libRIP.A.dylib 545.0.0 (compatibility 64.0.0) <5FF3D7FD-84D8-C5FA-D640-90BB82EC651D> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ CoreGraphics.framework/Versions/A/Resources/libRIP.A.dylib
        0x7fff83904000 -     0x7fff83904ff7  com.apple.ApplicationServices 38 (38) <10A0B9E9-4988-03D4-FC56-DDE231A02C63> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Application Services
        0x7fff83914000 -     0x7fff83af6fef  libType1Scaler.dylib ??? (???) <7892C4D7-3E5E-D7DA-AA4E-8D4ACED143D9> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ ATS.framework/Versions/A/Resources/libType1Scaler.dylib

    I havent had the exact same problem as you but I am having a similar problem where lately I noticed when working in Pro Tools (mainly because I use my mac pro for audio work) or even when on the internet whatever it may be that my screen has been flickering a little bit or gets slightly glitchy.
    Yesterday upon startup for the first time the screen went black. Had to do a force shutdown. Unplugged all external devices. Reset everything as well. Slowly checked everything was on the phone with Apple even during the process. Seemed to correct the issue. Then of course I get off the phone, restarted my computer and it goes black randomly again.
    Rebooted fine. Checked all my hard disks internal and external, verified and repaired permissions on main drive and clone. Since then nothing yet...But I still feel its either the Video Card or the Monitor as everything else is fully operational.
    I plan on taking it in to look at as my applecare is up in November but I cant point my finger on it. And really am trying to avoid lugging the mac pro and monitor in at the same time...(Not the easiest thing with lack of parking in nyc..)
    If the display was dying I feel like it would have konked out already.
    The funny thing is I have had to replace video cards and monitors in the past but this time I cant quite figure out what the **** is going on.
    I am leaning towards the video card as I noticed it flickered a little when opening plug in windows in pro tools or multiple windows in sfari but it doesnt make sense.
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    I  totally baffled but the randomness of this.

  • Mini ppc w/ beachball problem and attached monitor going black frequently

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    Have you run the Apple hardware test on it? Or if you have Applecare, the TechTools Deluxe test? To run the Apple hardware test, insert the first OS X disc that came with the system, which should say 'AHT Version x.x' in small print on the label. Reboot, holding the option key down. Choose the Apple hardware test, click the arrow pointing to the right, and follow directions. Does it identify any issues?
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    A number of people with slowing systems, with frequent beach balls, have used OnyX to clean up their system, which has made a performance difference. You can get it from http://www.titanium.free.fr/pgs2/english/download.html . Run the activities on the maintenance and cleaning tabs, which may require a reboot. Does that help?
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    Had a second-hand TV once (I am cheap -- sue me).  One day the screen went fritzy and the room smelled of ozone.
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  • My 3rd generation ipad even though my battery is at 100 % the screen goes black after sitting for more than 15 mins. The only way to get it to come is by resetting the ipad. Is there a fix for this. It all started after the last two updates.

    my 3rd generation ipad even though my battery is at 100 % the screen goes black after sitting for more than 15 mins. The only way to get it to come is by resetting the ipad. Is there a fix for this. It all started after the last two updates.

    Try a Reset...
    Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears. Release the Buttons.
    If no joy... Try a Restore...
    1: Connect the device to your computer and open iTunes.
    2: If the device appears in iTunes, select and click Restore on the Summary pane.
    3: If the device doesn't appear in iTunes, try using the steps in this article to force the device into recovery mode.
    From Here
    Unresponsive iPad
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  • Hello my MBP 15" stops at grey screen after apple logo disappears

    hello, my MBP 15" stops at grey screen after apple logo disappears, what can i do about this? ive tried booting into safe mode but screen turns blue with black lines also tried resetting NVRAM and PVRAM but still stops at grey screen, also tried using applejack, it shows no problems at all, says my disk volume is ok but the screen still stops at grey during start up, havent tried the installation disk thing because i dont have my installation disk with me

    Take each of these steps that you haven't already tried. Stop when the problem is resolved.
    Step 1
    The first step in dealing with a startup failure is to secure the data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since the last backup, you can skip this step.   
    There are several ways to back up a Mac that is unable to start. You need an external hard drive to hold the backup data.
         a. Start up from the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.”
    b. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, start the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
    c. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
    Step 2
    If the startup process stops at a blank gray screen with no Apple logo or spinning "daisy wheel," then the startup volume may be full. If you had previously seen warnings of low disk space, this is almost certainly the case. You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else use either of the techniques in Steps 1b and 1c to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.
    Step 3
    Sometimes a startup failure can be resolved by resetting the NVRAM.
    Step 4
    If you use a wireless keyboard, trackpad, or mouse, replace or recharge the batteries. The battery level shown in the Bluetooth menu item may not be accurate.
    Step 5
    If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
    Step 6
    Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to start up, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can start up now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
    Step 7
    If you've started from an external storage device, make sure that the internal startup volume is selected in the Startup Disk pane of System Preferences.
    Start up in safe mode. Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a Fusion Drive or a software RAID, you can’t do this. Post for further instructions.
    Safe mode is much slower to start and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
    The login screen appears even if you usually log in automatically. You must know the login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
    When you start up in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, the startup volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 10. If you ever have another problem with the drive, replace it immediately.
    If you can start and log in in safe mode, empty the Trash, and then open the Finder Info window on the startup volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then restart as usual (i.e., not in safe mode.)
    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.

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