My macbook pro's fan is working overtime and it is killing my battery. in ten minutes i lost 11%

my macbook pro's fan is working overtime and it is killing my battery. in ten minutes i lost 11%

The Apple article below may help.
http://support.apple.com/kb/TS1473
Stedman

Similar Messages

  • 2 issues with MacBook Pro Retina - Fan randomly speeds up and USB3.0 Issues

    So I just purchased a brand new MacBook Pro Retina 15" 2.40GHz.
    Randomly, when nothing but finder is open, the fans will spin at full speed.
    I have opened every application on the machine including serato, ableton, photoshop, VLC playing a 1080P movie, iTunes playing music and youtube playing videos in 2 tabs - and the fans do not spin as fast at it does when nothing is open or running (confirmed with activity monitor too).
    Secondly, once I eject a USB3.0 drive from the machine, I have to reboot the system before the drive can be mounted, or even recognized at all by the computer. (it does not even show up in disk utility till the reboot). this happens with 2 seperate USB3.0 external hard drives that work fine on other rMBPs. This happens with both usb ports too.
    I have reset SMC, PRAM, ran all Apple updates as well as reinstalled the operating system (as well as booted from a known good system in target disk mode).
    Please help

    There are a few threads reporting the fan issues you are dealing with which you might want to look at. I have now experianced it with four brand new 2013 rMBP.
    Threads reagarding fan issues:
    https://discussions.apple.com/thread/4735947?tstart=0
    https://discussions.apple.com/thread/4744182?tstart=0

  • Hi, 2011 macbook pro 13.3". facetime works but they can't hear me after about 5 minutes, every time. They still see me moving, I still hear and see them moving. What can I do to fix this issue?

    Hi, 2011 macbook pro 13.3". Every time I use facetime after about 5 minutes they can't hear me. They still see me moving and I see them moving and also hear them. Anyone have a reccommendation on how to fix this? thanks
    Rob

    sounds like third party drivers interfering. How do you connect your audio or are you using your computer speakers?
    Have you tried going into system preferences audio midi setup and making sure your mic is selected?
    This could be the people you are trying to reach's issue where they might have something running that cuts out the audio for them.
    try hitting Video, internal mic, when you're on facetime. if it's selected, then you might want to try to connect with someone else and see if the issue persists.

  • After upgrading to Mavericks, my macbook pro (15' early 2011) keeps crashing and restarting when running on battery.

    It happens too much. I have 8gbs of Kingstom RAM installed. Is there a problem with Mavericks and Kingstom RAM?
    This is the report i get after restarting:
    Anonymous UUID:       0BAE1215-28B3-3F86-AA86-D3E08FC8B1AC
    Mon Nov 18 00:23:03 2013
    panic(cpu 0 caller 0xffffff7fa7d4b041): "AGC GPU REGISTER RESTORE FAILED : rdar://7254528, VendorID invalid"@/SourceCache/AppleGraphicsControl/AppleGraphicsControl-3.4.12/src/Appl eMuxControl/kext/AGCPowerManagement.cpp:1036
    Backtrace (CPU 0), Frame : Return Address
    0xffffff810ea23de0 : 0xffffff8026022f69
    0xffffff810ea23e60 : 0xffffff7fa7d4b041
    0xffffff810ea23ea0 : 0xffffff7fa7d4d668
    0xffffff810ea23ec0 : 0xffffff80264b05fb
    0xffffff810ea23f20 : 0xffffff802604a15a
    0xffffff810ea23fb0 : 0xffffff80260d6aa7
          Kernel Extensions in backtrace:
             com.apple.driver.AppleMuxControl(3.4.12)[A4934A66-0E30-36E9-984A-650481102449]@ 0xffffff7fa7d40000->0xffffff7fa7d52fff
                dependency: com.apple.driver.AppleGraphicsControl(3.4.12)[661E3C87-5B97-3272-88FF-B9BA9B6E2 4ED]@0xffffff7fa7d27000
                dependency: com.apple.iokit.IOACPIFamily(1.4)[045D5D6F-AD1E-36DB-A249-A346E2B48E54]@0xfffff f7fa69fb000
                dependency: com.apple.iokit.IOPCIFamily(2.8)[447B4896-16FF-3616-95A2-1C516B2A1498]@0xffffff 7fa66ba000
                dependency: com.apple.iokit.IOGraphicsFamily(2.3.6)[38E388A5-92D6-3388-B799-F2498E582287]@0 xffffff7fa6f31000
                dependency: com.apple.driver.AppleBacklightExpert(1.0.4)[E04639C5-D734-3AB3-A682-FE66694C66 53]@0xffffff7fa7d3b000
    BSD process name corresponding to current thread: kernel_task
    Mac OS version:
    13A603
    Kernel version:
    Darwin Kernel Version 13.0.0: Thu Sep 19 22:22:27 PDT 2013; root:xnu-2422.1.72~6/RELEASE_X86_64
    Kernel UUID: 1D9369E3-D0A5-31B6-8D16-BFFBBB390393
    Kernel slide:     0x0000000025e00000
    Kernel text base: 0xffffff8026000000
    System model name: MacBookPro8,2 (Mac-94245A3940C91C80)
    System uptime in nanoseconds: 638958040535
    last loaded kext at 311440015536: com.apple.filesystems.smbfs          2.0.0 (addr 0xffffff7fa8608000, size 335872)
    last unloaded kext at 318563611238: com.apple.filesystems.msdosfs          1.9 (addr 0xffffff7fa85fa000, size 57344)
    loaded kexts:
    com.apple.filesystems.smbfs          2.0.0
    com.apple.filesystems.autofs          3.0
    com.apple.driver.AudioAUUC          1.60
    com.apple.driver.AppleHWSensor          1.9.5d0
    com.apple.filesystems.ntfs          3.11
    com.apple.driver.AGPM          100.14.11
    com.apple.iokit.IOBluetoothSerialManager          4.2.0f6
    com.apple.driver.AppleMikeyHIDDriver          124
    com.apple.driver.AppleUpstreamUserClient          3.5.13
    com.apple.iokit.IOUserEthernet          1.0.0d1
    com.apple.driver.AppleMikeyDriver          2.5.2fc2
    com.apple.kext.AMDFramebuffer          1.1.4
    com.apple.driver.AppleIntelHD3000Graphics          8.1.8
    com.apple.driver.AppleHDA          2.5.2fc2
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.AppleHWAccess          1
    com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0
    com.apple.driver.AppleSMCPDRC          1.0.0
    com.apple.driver.AppleLPC          1.7.0
    com.apple.AMDRadeonX3000          1.1.4
    com.apple.driver.AppleSMCLMU          2.0.4d1
    com.apple.driver.AppleMuxControl          3.4.12
    com.apple.driver.AppleMCCSControl          1.1.12
    com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport          4.2.0f6
    com.apple.driver.SMCMotionSensor          3.0.4d1
    com.apple.driver.AppleIntelSNBGraphicsFB          8.1.8
    com.apple.kext.AMD6000Controller          1.1.4
    com.apple.driver.AppleThunderboltIP          1.0.10
    com.apple.driver.AppleUSBTCButtons          240.2
    com.apple.driver.AppleUSBTCKeyboard          240.2
    com.apple.driver.AppleIRController          325.7
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.BootCache          35
    com.apple.driver.XsanFilter          404
    com.apple.iokit.IOAHCIBlockStorage          2.4.0
    com.apple.driver.AppleUSBHub          650.4.4
    com.apple.driver.AppleSDXC          1.4.0
    com.apple.iokit.AppleBCM5701Ethernet          3.6.9b9
    com.apple.driver.AirPort.Brcm4331          700.20.22
    com.apple.driver.AppleFWOHCI          4.9.9
    com.apple.driver.AppleAHCIPort          2.9.5
    com.apple.driver.AppleUSBEHCI          650.4.1
    com.apple.driver.AppleSmartBatteryManager          161.0.0
    com.apple.driver.AppleRTC          2.0
    com.apple.driver.AppleACPIButtons          2.0
    com.apple.driver.AppleHPET          1.8
    com.apple.driver.AppleSMBIOS          2.0
    com.apple.driver.AppleACPIEC          2.0
    com.apple.driver.AppleAPIC          1.7
    com.apple.driver.AppleIntelCPUPowerManagementClient          216.0.0
    com.apple.nke.applicationfirewall          153
    com.apple.security.quarantine          3
    com.apple.driver.AppleIntelCPUPowerManagement          216.0.0
    com.apple.kext.triggers          1.0
    com.apple.iokit.IOSCSIArchitectureModelFamily          3.6.0
    com.apple.iokit.IOSerialFamily          10.0.7
    com.apple.iokit.IOSurface          91
    com.apple.iokit.IOBluetoothFamily          4.2.0f6
    com.apple.driver.DspFuncLib          2.5.2fc2
    com.apple.vecLib.kext          1.0.0
    com.apple.iokit.IOAudioFamily          1.9.4fc11
    com.apple.kext.OSvKernDSPLib          1.14
    com.apple.iokit.IOFireWireIP          2.2.5
    com.apple.driver.AppleSMBusPCI          1.0.12d1
    com.apple.driver.IOPlatformPluginLegacy          1.0.0
    com.apple.driver.IOPlatformPluginFamily          5.5.1d27
    com.apple.iokit.IOAcceleratorFamily          98.7.1
    com.apple.driver.AppleBacklightExpert          1.0.4
    com.apple.iokit.IONDRVSupport          2.3.6
    com.apple.driver.AppleGraphicsControl          3.4.12
    com.apple.driver.AppleSMBusController          1.0.11d1
    com.apple.iokit.IOBluetoothHostControllerUSBTransport          4.2.0f6
    com.apple.driver.AppleSMC          3.1.6d1
    com.apple.driver.AppleHDAController          2.5.2fc2
    com.apple.iokit.IOHDAFamily          2.5.2fc2
    com.apple.kext.AMDSupport          1.1.4
    com.apple.AppleGraphicsDeviceControl          3.4.12
    com.apple.iokit.IOGraphicsFamily          2.3.6
    com.apple.driver.AppleThunderboltDPInAdapter          2.5.0
    com.apple.driver.AppleThunderboltDPAdapterFamily          2.5.0
    com.apple.driver.AppleThunderboltPCIDownAdapter          1.4.0
    com.apple.driver.AppleUSBMultitouch          240.6
    com.apple.driver.AppleUSBMergeNub          650.4.0
    com.apple.iokit.IOUSBHIDDriver          650.4.4
    com.apple.driver.AppleUSBComposite          650.4.0
    com.apple.driver.AppleThunderboltNHI          1.9.2
    com.apple.iokit.IOThunderboltFamily          2.8.5
    com.apple.iokit.IOUSBUserClient          650.4.4
    com.apple.iokit.IOEthernetAVBController          1.0.3b3
    com.apple.driver.mDNSOffloadUserClient          1.0.1b4
    com.apple.iokit.IO80211Family          600.34
    com.apple.iokit.IONetworkingFamily          3.2
    com.apple.iokit.IOFireWireFamily          4.5.5
    com.apple.iokit.IOAHCIFamily          2.6.0
    com.apple.iokit.IOUSBFamily          650.4.4
    com.apple.driver.AppleEFINVRAM          2.0
    com.apple.driver.AppleEFIRuntime          2.0
    com.apple.iokit.IOHIDFamily          2.0.0
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.security.sandbox          278.10
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.security.TMSafetyNet          7
    com.apple.driver.AppleKeyStore          2
    com.apple.driver.DiskImages          371.1
    com.apple.iokit.IOStorageFamily          1.9
    com.apple.iokit.IOReportFamily          21
    com.apple.driver.AppleFDEKeyStore          28.30
    com.apple.driver.AppleACPIPlatform          2.0
    com.apple.iokit.IOPCIFamily          2.8
    com.apple.iokit.IOACPIFamily          1.4
    com.apple.kec.pthread          1
    com.apple.kec.corecrypto          1.0

    Hi. I'm not trying to rush things, you may have a different problem, but your issue looks quite familiar to me. I recently had a problem with the discrete graphics card (the Radeon GPU) due to overheating, all because a faulty application of the thermal compound in the factory.
    In my case, the problem started slowly and intermittently, a few days after a gaming session (Quake 3) of about three hours (at the moment, I didn't realized that could be linked to the problem).
    This issue is being actively discussed in another threads in this forum, but so far there's enough evidence that it's been causing similar problems for 2011 MBPs owners: screen corruption, black/blue screens, and in some cases, a total inability to boot. Some of the threads I'm talking about:
    https://discussions.apple.com/message/13150366#13150366
    https://discussions.apple.com/message/21110132#21110132
    So far, and since the problem seems to affect only the discrete GPU (that's why you can boot in safe mode) a possible solution is to disable it by removing some extensions which prevent OS X from loading the Radeon drivers. This post describing the process (there are different files involved depending of your GPU version, so make sure you are moving the right ones):
    https://discussions.apple.com/message/22521574#22521574
    In the case your discrete GPU survived and is not permanently damaged, I personally had success by changing the thermal compound myself, which completely fixed the problem (at least for now). I've posted about it here:
    https://discussions.apple.com/message/22630561#22630561
    I hope you can find a solution, believe me I know the feeling when you see your expensive machine turning into a brick and it *****.
    Good luck!

  • MacBook Pro Loud Fan Noise

    I am having issues with my MacBook Pro's fan running really loud and getting very hot. Can you please help based on the 'Activity Manager' saved file below?
    Active Memory: 721.5 MB
    Free Memory: 2.44 GB
    Wired Memory: 561.3 MB
    Used Memory: 1.43 GB
    Inactive Memory: 185.8 MB
    Total VM: 137.72 GB
    Number of processes: 55
    PID    Process Name              User       CPU      Real Mem        Virtual Mem   
    0      kernel_task               root       5.9      200.7 MB        2.39 GB         
    1      launchd                   root       0.0      1.3 MB          2.36 GB         
    10     kextd                     root       0.0      5.5 MB          2.36 GB         
    11     DirectoryService          root       0.0      5.5 MB          2.36 GB         
    12     notifyd                   root       0.0      640 KB          2.34 GB         
    13     syslogd                   root       0.0      768 KB          2.36 GB         
    14     configd                   root       0.0      3.5 MB          2.38 GB         
    15     blued                     root       0.0      4.5 MB          2.36 GB         
    16     diskarbitrationd          root       0.0      1.6 MB          2.35 GB         
    17     distnoted                 daemon     0.0      1.4 MB          2.35 GB         
    18     mDNSResponder             _mdnsrespo 0.0      2.4 MB          2.36 GB         
    23     securityd                 root       0.0      2.7 MB          2.36 GB         
    26     ntpd                      root       0.0      1.1 MB          2.32 GB         
    27     krb5kdc                   root       0.0      2.0 MB          2.35 GB         
    31     usbmuxd                   _usbmuxd   0.0      2.1 MB          2.36 GB         
    32     SystemStarter             root       0.0      1.0 MB          2.35 GB         
    36     RFBRegisterMDNS           root       0.0      1.8 MB          2.33 GB         
    38     mds                       root       0.1      35.5 MB         2.55 GB         
    39     loginwindow               Lease      0.0      7.9 MB          2.63 GB         
    40     KernelEventAgent          root       0.0      1.0 MB          2.34 GB         
    42     hidd                      root       1.4      1.6 MB          2.35 GB         
    43     fseventsd                 root       0.0      2.0 MB          2.36 GB         
    45     dynamic_pager             root       0.0      796 KB          2.32 GB         
    52     autofsd                   root       0.0      1.0 MB          2.34 GB         
    55     PocketCloudService        root       0.0      3.5 MB          637.8 MB        
    56     vpnagentd                 root       0.0      3.2 MB          621.0 MB        
    73     coreservicesd             root       0.3      20.2 MB         2.38 GB         
    75     WindowServer              _windowser 3.7      52.6 MB         3.02 GB         
    78     TiVoDesktop               root       0.1      57.6 MB         908.9 MB        
    84     cvmsServ                  root       0.0      852 KB          2.33 GB         
    97     coreaudiod                _coreaudio 0.0      2.7 MB          2.36 GB         
    100    launchd                   Lease      0.0      1.0 MB          2.36 GB         
    104    Dock                      Lease      0.0      12.3 MB         2.65 GB         
    105    SystemUIServer            Lease      0.0      20.5 MB         2.71 GB         
    106    Finder                    Lease      0.1      15.1 MB         2.66 GB         
    109    pboard                    Lease      0.0      860 KB          2.32 GB         
    110    fontd                     Lease      0.0      7.2 MB          2.40 GB         
    118    UserEventAgent            Lease      0.0      7.3 MB          2.38 GB         
    121    ARDAgent                  Lease      0.0      3.0 MB          2.61 GB         
    127    AirPort Base Station Agen Lease      0.0      5.8 MB          2.64 GB         
    131    imagent                   Lease      0.0      14.6 MB         2.63 GB         
    139    Apple80211Agent           Lease      0.0      13.1 MB         10.69 GB        
    140    applepushserviced         root       0.0      6.2 MB          2.37 GB         
    141    AppleVNCServer            Lease      0.0      3.8 MB          2.60 GB         
    150    Safari                    Lease      0.0      94.6 MB         3.78 GB         
    152    Safari Web Content        Lease      0.3      187.5 MB        3.82 GB         
    163    mdworker                  Lease      0.0      11.8 MB         2.38 GB         
    184    cvmsComp_x86_64           Lease      0.0      6.0 MB          2.34 GB         
    188    Activity Monitor          Lease      5.6      28.9 MB         2.76 GB         
    190    activitymonitord          root       0.6      1.3 MB          2.33 GB         
    191    Quick Look Helper         Lease      0.0      76.1 MB         3.98 GB         
    194    cvmsComp_i386             Lease      0.0      2.8 MB          599.1 MB        
    196    ocspd                     root       0.0      1.4 MB          2.34 GB         
    199    SpotifyWebHelper          Lease      0.0      2.2 MB          873.6 MB        
    203    SFLIconTool               Lease      0.0      1.1 MB          2.33 GB         

    Hello, LeaseBL. 
    Thank you for visiting Apple Support Communities. 
    Try resetting the System Management Control to see if the fan noise ceases.  Also, make sure there are no obstructions to the fan as well as the portable is on a flat surface when in use. 
    Intel-based Macs: Resetting the System Management Controller (SMC)
    http://support.apple.com/kb/HT3964
    Cheers,
    Jason H. 

  • I have a macbook pro the fan wont stop running the keyboard light is not working and the it wont charge all happened all of a sudden what to do please.

    have a macbook pro the fan wont stop running the keyboard light is not working and the it wont charge all happened all of a sudden what to do please.

    Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the method for:
    "Resetting SMC on portables with a battery you should not remove on your own".
    If this does not help, you may have to take the MBP to the Apple Store  to have it checked.
    Best

  • HT3986 when i use windows 7 with macbook pro ,the fan work hardly,how do i fix it?

    when i use windows 7 with macbook pro ,the fan work hardly,how do i fix it?

    Use InputRemapper
    This is one or only utility I know, there are I am sure one or two others.
    And the weakest link in running Windows on Mac: lack of thermal/SMC fan control to manage air flow and heat!

  • One of my MacBook Pro's fans is running at full speed

    Out of the blue today, my 2011 MacBook Pro started fans went mental when I awoke if from it's sleep. They started running at full speed, far louder than I've ever heard them before. I searched through other discussions and it suggested I try an SMC reset. I performed one of these with no success.
    I then opened smcFanControl and noticed that my leftside fan was running at 7000rpm+ and the rightside fan was running at normal speed 2000rpm. It randomly spools on and off high speed and I cannot find any fixes or similar problems online. Can anyone suggest a fix for this or should I be taking it to a repairer?
    FYI my logic board was only replaced in April under warranty so could it be faulty?

    Hi andyBall_uk
    SMC fan control measures temp also. Currently running at 47*C as you can see in the screenshot below. I tried overriding the fan speeds...works for the right fan but not the left one so it appears only the left fan has the fault.
    The weird thing is, when you press your finger down anywhere on the left speaker next to the built-in keyboard, the fan slows back down to normal speed, but when you let go it speeds back up again. I might open it up in the morning to see if any of the connections are loose, because it seems weird that this happens with a small amount of pressure applied to the body. Also of you tilt the macbook it sometimes slows back down to normal speed (but sometimes stays at high speed). I will let you know how I go. Thanks for your suggestion/s

  • After Mountain Lion install, my MacBook Pro's fan is running non-stop.

    After Mountain Lion install, my MacBook Pro's fan is running non-stop and you can hear the insides working extra hard. Is this normal? It's very loud and annoying?

    http://support.apple.com/kb/HT3964?viewlocale=en_US

  • Please help! Itunes fails to open on my macbook pro. I have remove itunes and reinstalled it and it still will not work!, Please help! Itunes fails to open on my macbook pro. I have remove itunes and reinstalled it and it still will not work!

    Please help! Itunes fails to open on my macbook pro. I have removed itunes and reinstalled it and it still will not work!

    Try removing the Genius database.  In the "Finder" go to the /username/Music/iTunes/ folder and delete the "iTunes Library Genius.itdb" file. This may allow the program to launch again. This file will be recreated upon first use of the "Genius" feature.

  • HT1800 Trying to add a wireless printer to my MacBook Pro.  It was working properly until we had to buy a new modem.  I have gone through the steps associated with my printer and the other laptop in the house (Dell) working right. MacBook says printer dis

    I am trying to add a wireless printer to my MacBook Pro.  It was working properly until we had to get a new modem.  I have gone through the steps with the printer customer service rep, and it was working properly for one day.  When I booted up the next morning, the printer was no longer "connected".  It will work if I have the printer and computer connected, but I much prefer the wireless capability.  Suggestions? The printer is a Brother MFC7860DW.  The other laptop in the house (Dell) can print wirelessly so I don't think it's an issue with the modem or the printer.

    Hello,
    Mac OS X: About the Reset Printing System feature ...
    http://support.apple.com/kb/HT1341?viewlocale=en_US
    10.5/10.6/10.7 instructions...
    In System Preferences>Fax & Print, Right click or Control+click on the Printers list Sidebar, choose Reset Printing System.
    if you hold option and click the "-" tab it resets the printing system.
    http://www.macosxhints.com/article.php?story=20031215144430486
    Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions.
    Any devices that previously appeared in your Printer List and Fax List will need to be added again after resetting the printing system.
    Resetting the printing system in Mac OS X 10.5.x+++
        1.    To use the Reset Printing System feature in Mac OS X 10.5.x, follow these steps:
        2.    Choose System Preferences from the Apple menu.
        3.    Choose Print & Fax from the View menu.
        4.    Control-click on list of printers on the left side of the window, then choose "Reset printing system" from the contextual menu. If you don't see a list of printers, Control-click on the text "Click + to add a printer or fax" and select "Reset printing system..." 
   
  As an alternative, if you currently have one or more printers listed, you can Option-click the "-" (Remove printer) button.
    http://support.apple.com/kb/ht1341
    Reboot.

  • I have 10.7.3 lion on my computers an iMac and a macbook pro plus a new iPod touch, and two older touches, now trying to sync my calendars is not working deletes some events, duplicates others, I want all my calendars to be the same.  Any ideas

    I have 10.7.3 lion on my computers an iMac and a macbook pro plus a new iPod touch, and two older touches, now trying to sync my calendars is not working deletes some events, duplicates others, I want all my calendars to be the same.  Any ideas

    Have you tried resetting the SMC ?     >  Resetting the System Management Controller (SMC)

  • I have a 2009 Macbook Pro with 1T hdd 8GB Ram and ran Maverick without problem...Yosemite installation has me completely frozen, nothing works but the spinning ball...I had to force shutdown last night, and haven't turned it on again...what do you ad

    I have a 2009 Macbook Pro with 1T hdd 8GB Ram and ran Maverick without problem...Yosemite installation has me completely frozen, nothing works but the spinning ball...I had to force shutdown last night, and haven't turned it on again...what do you advise?  During installation emptied cache, etc. Backed up using time machine, fortunately.

    Try these in order testing your system after each to see if it's back to normal:
    1. a. Resetting your Mac's PRAM and NVRAM
        b. Intel-based Macs: Resetting the System Management Controller (SMC)
    2. Restart the computer in Safe Mode, then restart again, normally. If this doesn't help, then:
    Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the Utilities menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
    3. Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the Utilities menu. Repair the Hard Drive and Permissions as follows.
    When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu. Select Restart from the Apple menu.
    4. Reinstall Yosemite: Reboot from the Recovery HD. Select Reinstall OS X from the Utilities menu, and click on the Continue button.
    Note: You will need an active Internet connection. I suggest using Ethernet if possible
                because it is three times faster than wireless.
    5. Reinstall Yosemite from Scratch:
    Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
    How to Clean Install OS X Yosemite
    Note: You will need an active Internet connection. I suggest using Ethernet if possible
                because it is three times faster than wireless.

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