MacBook Pro goes grey screen, then shuts down randomly

My MacBook Pro (just purchased 3 months ago, not retina) shuts down unexpectedly. The screen goes grey, then it just shuts down after a few minutes. Anyone else have this problem? Any ideas how to fix?

You need to reset the SMC on your Macbook.
* Shutdown your MacBook Pro
* Connect the power adapter to your Mac
* On the MacBook's keyboard, hold down the Shift+Control+Option keys and the Power button at the same time
* Release all keys and the power button at the same time
* Boot your Mac as usual

Similar Messages

My MacBook Pro Core Duo from 2006 shuts down randomly requiring frequent reboots to the point I had to abandon doing any project or anything on this MacBook Pro. Same thing occurs with the iMac dual core from 2007. MacBook battery replaced.

My MacBook Pro Core Duo from 2006 shuts down randomly requiring frequent reboots to the point I had to abandon doing any project or anything on this MacBook Pro. Same thing occurs with the iMac dual core from 2007. MacBook battery replaced. Is it internal battery for both, new logic board required, bad hard drive, or bad RAM?
Help.

Run an Apple Hardware Test using the original installation disk that has the AHT instructions on it.
Try SMC and PRAM resets:
http://support.apple.com/kb/ht3964
http://support.apple.com/kb/ht1379
It is possible that you may need a new PRAM battery.
Ciao.

My 2012, 17" macbook pro starts, gray screen and shuts down.

Anybody knows why my 2012, 17" macbook pro is starting with gray screen and mac logo and shuts down after?
I have Mavrick on. Last night i tried to use itunes and got an error for the first time. It said " itunes was corrupted or not installed correctly" . There is no reason because i listened to music just day before. After working on some docs i shut down the laptop. This morning when i tried to start up it didnt happened. Tried all shortcuts to do recorvery. It said " mac HD and Recorvery HD" both are blocked and not accessible.
Ran another doagnoses, checked hard drive and got errors.
I cant see why hard drive might be damaged.
Plz help me out. I didnt do any backup and dont ant to reformat it.
Thanks
-Soleil

Well, i tried different things. First tried Recorvery start. It showed mac HD and Recovery HD but i couldnt choose any, said it was locked.
When i diagnosed the hard drive, dont remember exactly but it ran the HD test and on red showed Hard Drive damaged.
Tonight after putting this questions here i tried again Online Help option, i could see all my folders, files, applications but couldnt open any. It was using Safari.
Not sure whats going on. All started with getting slow and i didnt turn the laptop off "was on sleep" for few days till last night.
Like i said before, last night i couldnt start iTunes, but didnt pay attention to it and shut off laptop. Only if i knew it wont start up again.. :-(

Macbook pro goes sleeping instead of shutting down

I have a macbook pro 15inch and for the past few days, when i try to shut it down, it goes off but with the front light still lit as if it's in sleep mode. When i try switching it back on it won't until I press the button for 4-5 sec. It boots up again and i get the message that the mac was restarted due to a problem. Can anyone tell me what's the cause of this problem???
Thanks

Try 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".

IPad turned into blue screen then shut down how to fix?

iPad turned into blue screen then shut down how to fix I cannot play games..

Reset the device:
Press and hold the Sleep/Wake button and the Home button together for at least ten seconds, until the Apple logo appears.
If that doesn't help, restore your iPad using iTunes or iCloud > iOS: Back up and restore your iOS device with iCloud or iTunes

My macbook pro doesn't restart or shut down from the apple menu. I run 10.7.5, any suggestions?

My macbook pro doesn't restart or shut down from the apple menu. I run 10.7.5, any suggestions?

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".
Best.

Early 2011 2GHz Macbook pro distorted blue screen then wont boot, 3 times in last 2 weeks

I have an early 2011, 2GHz macbook pro (15' model with ati radeon graphics). It was running fine for the last two years. Over the last couple of weeks, following things happen:
1. I was running on bootcamp windows, browsing and some flash content was open, suddenly distorted blue stripes appear and it froze. Force shut down using power button, turn on again and it wont boot on windows or mac, or recovery partition or from the dvd. Tried for about 4 hours, after nvram, pram reset, it was able to safe boot, then run disk utility to verify and repair the disk, it said that there were problems with hard drive and fixed,then booted normally.
2. I thought that the problem might be because I was on windows, so took a back up of the windows drive, erased it and installed windows 8 using bootcamp. It ran well for an week. After that, once I connected it with the tv using HDMI to watch a video, after I disconnected it, the screen was garbled over the windows start screen, but I was able to command restart normally. After restart, it wont boot to windows or mac.
3. After several hours of trying, i was able to boot using the dvd this time, it said it 'can not install mac on the hard drive', erased the hard drive and it was able to install the os (snow leopard). After completing install, logged in to app store to download previously purchased mountain lion. Then ran it to upgrade the os, after the upgrade was completed, at the point when it prompts for apple id and password to set up icloud, it again froze with distorted blue screen. Shut down forcefully. Then turn on again and it wont boot. After the white screen and the sound, it shows the apple logo and spinning wheel for a while, then a bright white screen and nothing happens.
Can anybody help reading the symptoms?

I have the Early 2011 2GHz Macbook Pro and I have the same problem too.
I switched out the logicboard a month ago and today the graphics just went distorted.
Any solutions? Now I'm thinking it is the Graphics Card.

Grey screen on shut down

Every once in a while when I go to shut down my Mac Pro, it doesn't quite shut down, but instead I get a grey screen that is in several languages, and says to hold down the power button and restart the computer. After I do I get a note that the OS had quit. Everything seems fine after the restart. THis happened about a month ago, but I attributed it then to a laser keyboard and mouse that had been giving me trouble. When I replaced them, the problem stopped, but it happened again last night. Does anyone know what might cause this problem and is it something to worry about.

Kernel panic.
I'd refer to an FAQ and work through all the steps.
Heat, hardware, RAM, and more common with Leopard but can be triggered by software.
http://search.live.com/results.aspx?q=kernelpanic+faqmac&src=IE-SearchBox

Mac Pro starts up and then shuts down, how do I fix this?

Recently when I start up my Mac Pro it start its process and then I see the Apple Logo and then the screen goes black and the monitor says I think something like no digital signal. I have to start up my Mac Pro a number of times before it finally stays open. Because I use to see a bright flash when the Mac Pro would start up or shut down, I thought that may be the problem had to do with my monitor but I'm not sure. I tried disk utilities and Tech Tools Pro 6 but nothing so far has helped the problem. I don't think its my harddrive since all test say its OK. Then I remembered some says something that computers have an internal battery and that they need to be replaced from time to time. I don't know if my Mac Pro has a battery but does anyone know if this would cause my problem?

There is a pram battery but I don't think that's the cause of your problem.
Have you blown all the accumulated dust out of your machine?
Try reseating the video card, maybe the ram too.
Run Apple Hardware Test (boot from your second installer DVD, push D down immediatly after the boot chime).

I get grey screen it shuts down... Wont open

What is causing my macbook to open on grey screen loading bar then shuts down???

Your MBP may have HDD issues. Use this trouble shooting guide:
https://discussions.apple.com/docs/DOC-5282
Ciao.

MacBook Pro sometimes stays on after shut-down and drains the battery.

Sometimes my MacBook Pro stays on after I shut it down and it drains the battery until it dies. I return home to find it the clocks and everything have to be reset. It appears to be shut-down after I select that command, but on occasion it will remain on in a semi-on state and i need to force quit it w/ the power button. It usually shuts down ok, but this happens every once in a while and I have to continually double-check that it's off before leaving it. Otherwise, I will come back and the battery will be very warm and the machine is running, but not really on. Any ideas?

Problem solved by my own. But do not how :) magsafe again working and the laptop tooo

My MacBook Pro restarts (grey screen) when using hot corners.

I just updated to 10.8 from 10.6, and now, whenever I use Hot Corners, it goes to grey screen then restarts.
Any advice?

Now it is happening when I open Photo Booth. Here is the report to Apple:
Interval Since Last Panic Report: 71136 sec
Panics Since Last Report:          2
Anonymous UUID:                    32055E57-734D-0D0D-CBFF-DA1382947CDC
Fri Mar 1 10:08:03 2013
panic(cpu 2 caller 0xffffff7f93a19b25): NVRM[0/1:0:0]: Read Error 0x00000100: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0xd2000000 0xffffff80b28ef000 0x0a5480a2, D0, P2/4
Backtrace (CPU 2), Frame : Return Address
0xffffff808f0cb260 : 0xffffff801321d626
0xffffff808f0cb2d0 : 0xffffff7f93a19b25
0xffffff808f0cb360 : 0xffffff7f93b134b3
0xffffff808f0cb3c0 : 0xffffff7f93b13527
0xffffff808f0cb430 : 0xffffff7f93e28853
0xffffff808f0cb570 : 0xffffff7f93b39659
0xffffff808f0cb5a0 : 0xffffff7f93a238da
0xffffff808f0cb650 : 0xffffff7f93a1efac
0xffffff808f0cb840 : 0xffffff7f93a20ade
0xffffff808f0cb920 : 0xffffff7f94c11ad5
0xffffff808f0cb960 : 0xffffff7f94c27507
0xffffff808f0cb980 : 0xffffff7f94c46353
0xffffff808f0cb9c0 : 0xffffff7f94c463b1
0xffffff808f0cba00 : 0xffffff7f94c2cc43
0xffffff808f0cba50 : 0xffffff7f94be70fc
0xffffff808f0cbae0 : 0xffffff7f94be2efa
0xffffff808f0cbb10 : 0xffffff7f94be0aab
0xffffff808f0cbb40 : 0xffffff80136650c3
0xffffff808f0cbbc0 : 0xffffff8013667153
0xffffff808f0cbc20 : 0xffffff8013664b8f
0xffffff808f0cbd70 : 0xffffff80132981e1
0xffffff808f0cbe80 : 0xffffff8013220aed
0xffffff808f0cbeb0 : 0xffffff8013210448
0xffffff808f0cbf00 : 0xffffff801321961b
0xffffff808f0cbf70 : 0xffffff80132a5b16
0xffffff808f0cbfb0 : 0xffffff80132ced53
      Kernel Extensions in backtrace:
         com.apple.NVDAResman(8.0)[A4C53A36-22B6-3075-82B9-9DE612A9C015]@0xffffff7f939b2 000->0xffffff7f93cb4fff
            dependency: com.apple.iokit.IOPCIFamily(2.7.2)[B1B77B26-7984-302F-BA8E-544DD3D75E73]@0xffff ff7f93778000
            dependency: com.apple.iokit.IONDRVSupport(2.3.5)[86DDB71C-A73A-3EBE-AC44-0BC9A38B9A44]@0xff ffff7f9399e000
            dependency: com.apple.iokit.IOGraphicsFamily(2.3.5)[803496D0-ADAD-3ADB-B071-8A0A197DA53D]@0 xffffff7f9395b000
         com.apple.nvidia.nv50hal(8.0)[9F3D09B5-3158-3D9E-BDA3-E71576AAD3B7]@0xffffff7f9 3cc2000->0xffffff7f93fe4fff
            dependency: com.apple.NVDAResman(8.0.0)[A4C53A36-22B6-3075-82B9-9DE612A9C015]@0xffffff7f939 b2000
            dependency: com.apple.iokit.IOPCIFamily(2.7.2)[B1B77B26-7984-302F-BA8E-544DD3D75E73]@0xffff ff7f93778000
         com.apple.GeForce(8.0)[2E56ED9A-D848-3795-9E52-56BABDC9000C]@0xffffff7f94bc8000 ->0xffffff7f94c8afff
            dependency: com.apple.NVDAResman(8.0.0)[A4C53A36-22B6-3075-82B9-9DE612A9C015]@0xffffff7f939 b2000
            dependency: com.apple.iokit.IONDRVSupport(2.3.5)[86DDB71C-A73A-3EBE-AC44-0BC9A38B9A44]@0xff ffff7f9399e000
            dependency: com.apple.iokit.IOPCIFamily(2.7.2)[B1B77B26-7984-302F-BA8E-544DD3D75E73]@0xffff ff7f93778000
            dependency: com.apple.iokit.IOGraphicsFamily(2.3.5)[803496D0-ADAD-3ADB-B071-8A0A197DA53D]@0 xffffff7f9395b000
BSD process name corresponding to current thread: WindowServer
Mac OS version:
12C60
Kernel version:
Darwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 2012; root:xnu-2050.18.24~1/RELEASE_X86_64
Kernel UUID: 69A5853F-375A-3EF4-9247-478FD0247333
Kernel slide:     0x0000000013000000
Kernel text base: 0xffffff8013200000
System model name: MacBookPro6,2 (Mac-F22586C8)
System uptime in nanoseconds: 27109689313040
last loaded kext at 24144518198561: com.apple.driver.AppleUSBAudio    2.9.0f6 (addr 0xffffff7f9574f000, size 262144)
last unloaded kext at 26701165971225: com.apple.driver.AppleUSBAudio    2.9.0f6 (addr 0xffffff7f9574f000, size 262144)
loaded kexts:
com.Cycling74.driver.Soundflower    1.6.2
at.obdev.nke.LittleSnitch    3908
com.apple.filesystems.autofs    3.0
com.apple.driver.AppleHWSensor    1.9.5d0
com.apple.iokit.IOBluetoothSerialManager    4.0.9f33
com.apple.driver.AudioAUUC    1.60
com.apple.driver.AGPM    100.12.69
com.apple.driver.AppleMikeyHIDDriver    122
com.apple.driver.AppleHDA    2.3.1f2
com.apple.driver.AppleMikeyDriver    2.3.1f2
com.apple.GeForce    8.0.0
com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport    4.0.9f33
com.apple.iokit.IOUserEthernet    1.0.0d1
com.apple.driver.ApplePolicyControl    3.2.11
com.apple.driver.SMCMotionSensor    3.0.2d6
com.apple.driver.AppleUpstreamUserClient    3.5.10
com.apple.driver.AppleIntelHDGraphics    8.0.0
com.apple.driver.AppleSMCPDRC    1.0.0
com.apple.driver.AppleLPC    1.6.0
com.apple.driver.AppleSMCLMU    2.0.2d0
com.apple.driver.AppleIntelHDGraphicsFB    8.0.0
com.apple.driver.ACPI_SMC_PlatformPlugin    1.0.0
com.apple.driver.AppleMuxControl    3.2.11
com.apple.driver.AppleMCCSControl    1.0.33
com.apple.driver.AppleUSBTCButtons    235.4
com.apple.driver.AppleIRController    320.15
com.apple.driver.AppleUSBTCKeyboard    235.4
com.apple.driver.AppleUSBCardReader    3.1.0
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless    1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib    1.0.0d1
com.apple.BootCache    34
com.apple.iokit.SCSITaskUserClient    3.5.1
com.apple.driver.XsanFilter    404
com.apple.iokit.IOAHCIBlockStorage    2.2.2
com.apple.driver.AppleFWOHCI    4.9.6
com.apple.driver.AirPort.Brcm4331    602.15.22
com.apple.driver.AppleAHCIPort    2.4.1
com.apple.driver.AppleUSBHub    5.2.5
com.apple.iokit.AppleBCM5701Ethernet    3.2.5b3
com.apple.driver.AppleUSBEHCI    5.4.0
com.apple.driver.AppleEFINVRAM    1.6.1
com.apple.driver.AppleSmartBatteryManager    161.0.0
com.apple.driver.AppleACPIButtons    1.6
com.apple.driver.AppleRTC    1.5
com.apple.driver.AppleHPET    1.7
com.apple.driver.AppleSMBIOS    1.9
com.apple.driver.AppleACPIEC    1.6
com.apple.driver.AppleAPIC    1.6
com.apple.driver.AppleIntelCPUPowerManagementClient    196.0.0
com.apple.nke.applicationfirewall    4.0.39
com.apple.security.quarantine    2
com.apple.driver.AppleIntelCPUPowerManagement    196.0.0
com.apple.kext.triggers    1.0
com.apple.iokit.IOSerialFamily    10.0.6
com.apple.driver.DspFuncLib    2.3.1f2
com.apple.iokit.IOAudioFamily    1.8.9fc10
com.apple.kext.OSvKernDSPLib    1.6
com.apple.iokit.AppleBluetoothHCIControllerUSBTransport    4.0.9f33
com.apple.iokit.IOSurface    86.0.3
com.apple.iokit.IOBluetoothFamily    4.0.9f33
com.apple.driver.AppleSMBusPCI    1.0.10d0
com.apple.iokit.IOFireWireIP    2.2.5
com.apple.nvidia.nv50hal    8.0.0
com.apple.NVDAResman    8.0.0
com.apple.driver.AppleHDAController    2.3.1f2
com.apple.iokit.IOHDAFamily    2.3.1f2
com.apple.driver.AppleSMC    3.1.4d2
com.apple.driver.IOPlatformPluginLegacy    1.0.0
com.apple.driver.IOPlatformPluginFamily    5.2.0d16
com.apple.driver.AppleGraphicsControl    3.2.11
com.apple.driver.AppleBacklightExpert    1.0.4
com.apple.iokit.IONDRVSupport    2.3.5
com.apple.driver.AppleSMBusController    1.0.10d0
com.apple.iokit.IOGraphicsFamily    2.3.5
com.apple.driver.AppleUSBMultitouch    235.7
com.apple.iokit.IOUSBHIDDriver    5.2.5
com.apple.iokit.IOSCSIBlockCommandsDevice    3.5.1
com.apple.iokit.IOUSBMassStorageClass    3.5.0
com.apple.driver.AppleUSBMergeNub    5.2.5
com.apple.driver.AppleUSBComposite    5.2.5
com.apple.iokit.IOSCSIMultimediaCommandsDevice    3.5.1
com.apple.iokit.IOBDStorageFamily    1.7
com.apple.iokit.IODVDStorageFamily    1.7.1
com.apple.iokit.IOCDStorageFamily    1.7.1
com.apple.iokit.IOAHCISerialATAPI    2.5.0
com.apple.iokit.IOSCSIArchitectureModelFamily    3.5.1
com.apple.iokit.IOFireWireFamily    4.5.5
com.apple.iokit.IO80211Family    500.15
com.apple.iokit.IOAHCIFamily    2.2.1
com.apple.iokit.IOUSBUserClient    5.2.5
com.apple.iokit.IOEthernetAVBController    1.0.2b1
com.apple.iokit.IONetworkingFamily    3.0
com.apple.iokit.IOUSBFamily    5.4.0
com.apple.driver.AppleEFIRuntime    1.6.1
com.apple.iokit.IOHIDFamily    1.8.0
com.apple.iokit.IOSMBusFamily    1.1
com.apple.security.sandbox    220
com.apple.kext.AppleMatch    1.0.0d1
com.apple.security.TMSafetyNet    7
com.apple.driver.DiskImages    344
com.apple.iokit.IOStorageFamily    1.8
com.apple.driver.AppleKeyStore    28.21
com.apple.driver.AppleACPIPlatform    1.6
com.apple.iokit.IOPCIFamily    2.7.2
com.apple.iokit.IOACPIFamily    1.4
com.apple.kec.corecrypto    1.0
Model: MacBookPro6,2, BootROM MBP61.0057.B0F, 2 processors, Intel Core i7, 2.8 GHz, 4 GB, SMC 1.58f17
Graphics: Intel HD Graphics, Intel HD Graphics, Built-In, 288 MB
Graphics: NVIDIA GeForce GT 330M, NVIDIA GeForce GT 330M, PCIe, 512 MB
Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1067 MHz, 0x802C, 0x384A53463235363634485A2D314731443120
Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1067 MHz, 0x802C, 0x384A53463235363634485A2D314731443120
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x93), Broadcom BCM43xx 1.0 (5.106.98.81.22)
Bluetooth: Version 4.0.9f33 10885, 2 service, 11 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: ST9500420ASG, 500.11 GB
Serial ATA Device: MATSHITADVD-R   UJ-898
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfa100000 / 2
USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0xfa130000 / 5
USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x0236, 0xfa120000 / 4
USB Device: BRCM2070 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000 / 3
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8218, 0xfa113000 / 8
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfd100000 / 2
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd120000 / 4
USB Device: Built-in iSight, apple_vendor_id, 0x8507, 0xfd110000 / 3

Macbook pro wont start. grey screen then shuts off

I have been having some problems with my macbook when my battery would die and i would plug it in and try to turn it back on it would take forever to start back up. Sometimes i woudl have to unplug, take out the battery then put them back in and zap the pram and it would start. Then today it just started taking forever to restart so i shut it down and tried to restart now it starts goes to the grey screen and the little thing starts spinning and then about 5 sedc later it shuts itself down.
PLEASE HELP

If the Apple Hardware test does not bring up any problems with the hardware, I would advise doing an archive and install before you zero out the drive and erase all of the data on it.
Some things to keep in mind:
If your computer shuts down while booted to the install disk (either the AHT or the installer) you're looking at a hardware problem.
If you need to erase and install or send it in for repair of a hardware problem, you will need to back up any data you do not want to lose before doing so. If you are unable to do backups, an apple store or authorized service provider can do data retrieval for you. Bear in mind this is an optional service and you would be charged a fee for data retrieval.

Mid-2010 Macbook Pro Mavericks Grey Screen

My Macbook with 4 gb RAM won't boot standard, safe, or Recovery.. All three results in grey screen with apple logo and spinning wheel which freezes after a few minutes. It also won't boot a bootable Mavericks usb with install package. I can boot single user mode and also view whats going on in verbose. I could really use some help. I'm sure you'll need more information. I am including a photo of where the script stops. Thanks in advanced for any tips. PS: I've already tried resetting PRAM and the SMC has been reset as well.

Mac OS X- Gray screen appears during startup
Question (?) Mark, Blinking Folder, or Gray Screen at Startup
These are related but not identical issues. Their causes are outlined in Intel-based Mac- Startup sequence and error codes, symbols. Solutions may be found in:
A flashing question mark appears when you start your Mac
Mac OS X- Gray screen appears during startup
In most cases the problems may be caused by one or more of these:
a. Problem with the computer's PRAM - See Resetting your Mac's PRAM and NVRAM.
b. Boot drive's directory has been corrupted - Repair with Disk Utility.
c. Critical system files are damaged or deleted - Reinstall OS X.
d. The disk drive is physically non-functional - Replace the hard drive.
Note that the information I have provided is what Apple recommends, If other users suggest different solutions than found here, then be sure what they recommend does not impact on your warranty, if any, or ability to get continuing Apple service.
Please don't start removing drives or changing cables unless you know what you are doing and have exhausted other non-invasive alternatives outlined here. If you perform any work yourself that is unapproved by Apple, then you will void any warranty you may have and lose all further Apple Support.
Repair the Hard Drive and Permissions
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. 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 installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
The main difference if you are using Lion or Mountain Lion is that you must first boot from the Recovery HD. Simply boot from the Recovery HD to perform the above.
Reinstall Snow Leopard Without Erasing The drive
1. Repair the Hard Drive and Permissions
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. 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 installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Reinstall Snow Leopard
If the drive is OK then quit DU and return to the installer. Proceed with reinstalling OS X. Note that the Snow Leopard installer will not erase your drive or disturb your files. After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
Download and install Mac OS X 10.6.8 Update Combo v1.1.
Reinstalling Lion/Mountain Lion Without Erasing The Drive
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the 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.
Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main 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.
Reinstall Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion 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.

My MacBook Pro Snow Leopard will not shut down.

When I try to shut down my MacBook Pro it goes as far as the spinning wheel on the blue screen and will not complete the shutdown. I have to hold the power button to shut down completely.
Both disk and permission repair does not solve the problem.
Help please.

I had the exact same problem, the only way for me to fix it is to delete everything off your mac, or backup your data and reinstall the OS, but just reinstalling the OS won't fix it, back up your data (if you want to keep it) and then erase everything off your mac then put your data back in. Hope it helps.
Thomas

MacBook Pro goes grey screen, then shuts down randomly

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