Yosemite crashes on gray screen after I enter my password

I’m having serious problems with my MacBook Pro (15-inch, Early 2011) since I upgraded to Yosemite. However I am not entirely sure that it is because of Yosemite. Here is a description of what happens:
I turn on my Mac
The Apple logo briefly appears and then the two user account avatars are shown (me and Guest)
I click on my user account and it takes me to a new screen where I enter my password
I enter my password and there is now a progress bar (which is as slow as mass) underneath my user avatar
Once the progress bar is finished loading I’m taken to a blank gray screen
Nothing happens only I look at this gray screen for ages and eventually my Mac just shuts itself down and restarts
I cannot boot in Safe Mode
I cannot boot in Recovery Mode
I did manage to reset the PRAM but I was still getting the same behaviour that I described above
I also recently had the mother board changed by some Apple “Genius” as I was having problems with the computer shutting itself down while using it, screen freezing and weird graphics behaviour but this seems to be fixed now. I also ran an Apple Hardware Test and it returned no problems.
My Mac starts up every now and then (I’m actually writing this post on my Mac now) but the majority of the time I have the same problem time and time again. Does anybody have similar problems.
Can somebody please help me before I totally go off Apple products.
Thanks :-)

I looked in my system.log and I found the following info that may give a clue as to why this is happening to my Mac:
Nov  6 15:07:09 localhost kernel[0]: Failed to load kext com.apple.kec.Libm (error 0xdc008012).
Nov  6 15:07:18 My-MacBook-Pro kernel[0]: Failed to load kext com.apple.driver.SMCMotionSensor (error 0xdc008012).
Nov  6 15:07:18 My-MacBook-Pro kernel[0]: Failed to load kext com.apple.driver.AppleThunderboltEDMSink (error 0xdc008012).
Nov  6 15:07:18 My-MacBook-Pro kernel[0]: Failed to load kext com.apple.driver.AppleHV (error 0xdc008012).
Nov  6 15:07:18 My-MacBook-Pro kernel[0]: Failed to load kext com.apple.driver.AppleHWAccess (error 0xdc008012).
Nov  6 15:07:18 My-MacBook-Pro kernel[0]: Failed to load kext com.apple.driver.AppleSMCLMU (error 0xdc008012).
Nov  6 15:07:18 My-MacBook-Pro kernel[0]: Failed to load kext com.apple.driver.AppleHDAController (error 0xdc008012).
Nov  6 15:07:18 My-MacBook-Pro kernel[0]: Failed to load kext com.apple.driver.AppleSMCPDRC (error 0xdc008012).
Nov  6 15:07:18 My-MacBook-Pro kernel[0]: Failed to load kext com.apple.driver.AppleThunderboltIP (error 0xdc008012).
Nov  6 15:07:18 My-MacBook-Pro kernel[0]: Failed to load kext com.apple.iokit.IOBluetoothUSBDFU (error 0xdc008012).
Nov  6 15:07:18 My-MacBook-Pro kernel[0]: Failed to load kext com.apple.iokit.IOFireWireIP (error 0xdc008012).
Nov  6 15:07:18 My-MacBook-Pro kernel[0]: Failed to load kext com.apple.driver.AppleIntelHD3000Graphics (error 0xdc008012).
Nov  6 15:07:18 My-MacBook-Pro kernel[0]: Failed to load kext com.apple.driver.AppleMikeyDriver (error 0xdc008012).
Nov  6 15:07:18 My-MacBook-Pro kernel[0]: Failed to load kext com.apple.AMDRadeonX3000 (error 0xdc008012).
Nov  6 15:07:18 My-MacBook-Pro kernel[0]: Failed to load kext com.apple.iokit.IOUserEthernet (error 0xdc008012).
Nov  6 15:07:18 My-MacBook-Pro kernel[0]: Failed to load kext com.apple.driver.AppleUpstreamUserClient (error 0xdc008012).
Nov  6 15:07:18 My-MacBook-Pro kernel[0]: Failed to load kext com.apple.driver.AppleOSXWatchdog (error 0xdc008012).

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    Mar 31 16:17:58 localhost fseventsd[33]: log dir: /.fseventsd getting new uuid: NUMBER
    Mar 31 16:17:58 localhost blued[42]: Apple Bluetooth daemon started
    Mar 31 16:18:02 localhost mDNSResponder[28]: mDNSResponder mDNSResponder-258.21 (May 26 2011 14:40:13) starting
    Mar 31 16:18:03 localhost com.apple.usbmuxd[21]: usbmuxd-296.4 on Dec 21 2012 at 16:11:14, running 64 bit
    Mar 31 16:18:04 localhost configd[13]: bootp_session_transmit: bpf_write(en1) failed: Network is down (50)
    Mar 31 16:18:04 localhost configd[13]: DHCP en1: INIT transmit failed
    Mar 31 16:18:04 localhost configd[13]: network configuration changed.
    Mar 31 16:18:04 NAME configd[13]: setting hostname to "NAME.local"
    Mar 31 16:18:04 NAME /System/Library/CoreServices/loginwindow.app/Contents/MacOS/loginwindow[29]: Login Window Application Started
    Mar 31 16:18:04 NAME configd[13]: network configuration changed.
    Mar 31 16:18:04 NAME mDNSResponder[28]: mDNSPlatformSetDNSConfig: Error: dns_configuration_copy returned NULL
    Mar 31 16:18:04 NAME configd[13]: network configuration changed.
    Mar 31 16:18:11 NAME mds[27]: (Normal) DiskStore: Creating index for /
    Mar 31 16:18:17 NAME loginwindow[29]: Login Window Started Security Agent
    Mar 31 16:18:18 NAME WindowServer[71]: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
    Mar 31 16:18:18 NAME com.apple.WindowServer[71]: Sun Mar 31 16:18:18 NAME.local WindowServer[71] <Error>: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
    Mar 31 16:18:29 NAME SecurityAgent[92]: NSSecureTextFieldCell detected a field editor ((null)) that is not a NSTextView subclass designed to work with the cell. Ignoring...
    Mar 31 16:18:30 NAME loginwindow[29]: Login Window - Returned from Security Agent
    Mar 31 16:18:30 NAME loginwindow[29]: USER_PROCESS: 29 console
    Mar 31 16:18:30 NAME com.apple.launchd.peruser.501[96] (com.divx.agent.postinstall): Unknown key: LimitToSessionType
    Mar 31 16:18:30 NAME com.apple.launchd.peruser.501[96] (com.apple.ReportCrash): Falling back to default Mach exception handler. Could not find: com.apple.ReportCrash.Self
    Mar 31 16:18:36 NAME root[113]: /usr/libexec/ntpd-wrapper: scutil key State:/Network/Global/DNS not present after 30 seconds
    Mar 31 16:18:37 NAME root[130]: sntp options: a=2 v=1 e=0.100 E=5.000 P=2147483647.000
    Mar 31 16:18:37 NAME root[130]:     d=15 c=5 x=0 op=1 l=/var/run/sntp.pid f= time.apple.com
    Mar 31 16:18:37 NAME root[130]: sntp: getaddrinfo(hostname, ntp)  failed with nodename nor servname provided, or not known
    Mar 31 16:18:38 NAME-2 com.apple.launchd.peruser.501[96] (com.apple.mrt.uiagent[123]): Exited with exit code: 255
    Mar 31 16:18:38 NAME-2 com.apple.launchd.peruser.501[96] (com.apple.Kerberos.renew.plist[124]): Exited with exit code: 1
    Mar 31 16:19:55 NAME-2 XProtectUpdater[19]: NSURLConnection error: Error Domain=NSURLErrorDomain Code=-1009 UserInfo=0x100174890 "This computer’s Internet connection appears to be offline." Underlying Error=(Error Domain=kCFErrorDomainCFNetwork Code=-1009 UserInfo=0x1001744e0 "This computer’s Internet connection appears to be offline.")
    Mar 31 16:19:55 NAME com.apple.launchd[1] (com.apple.xprotectupdater[19]): Exited with exit code: 255
    Mar 31 16:22:04 NAME kextd[10]: updated kernel boot caches
    Mar 31 16:25:04 NAME Software Update[178]: SWU: scan found 0 products:
    Mar 31 16:25:05 NAME Software Update[178]: Error Domain=NSURLErrorDomain Code=-1009 UserInfo=0x10052e600 "This computer’s Internet connection appears to be offline." Underlying Error=(Error Domain=kCFErrorDomainCFNetwork Code=-1009 UserInfo=0x10052f760 "This computer’s Internet connection appears to be offline.")
    Mar 31 16:25:14 NAME com.apple.launchd[1] (com.apple.suhelperd[181]): Exited with exit code: 2
    Mar 31 16:25:18 NAME configd[13]: network configuration changed.
    Mar 31 16:26:17 NAME Software Update[188]: SWU: scan found 1 products:\n041-9605
    Mar 31 16:26:30 NAME ntpd[18]: time reset +1.140167 s
    Mar 31 16:26:57 NAME com.apple.launchd[1] (com.apple.suhelperd[190]): Exited with exit code: 2
    Mar 31 16:26:57 NAME com.apple.launchd.peruser.501[96] ([0x0-0xf00f].com.apple.Console[142]): Exited: Killed
    Mar 31 16:26:57 NAME com.apple.launchd.peruser.501[96] ([0x0-0x15015].com.apple.SoftwareUpdate[188]): Exited: Killed
    Mar 31 16:26:57 NAME com.apple.launchd.peruser.501[96] (com.apple.AirPortBaseStationAgent[126]): Exited: Killed
    Mar 31 16:26:57 NAME loginwindow[29]: DEAD_PROCESS: 29 console
    Mar 31 16:26:57 NAME /System/Library/CoreServices/loginwindow.app/Contents/MacOS/loginwindow[200]: Login Window Application Started
    Mar 31 16:26:58 NAME loginwindow[200]: USER_PROCESS: 200 console
    Mar 31 16:26:58 NAME WindowServer[203]: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
    Mar 31 16:26:58 NAME com.apple.WindowServer[203]: Sun Mar 31 16:26:58 NAME.local WindowServer[203] <Error>: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
    Mar 31 16:26:59 NAME Software Update[209]: Looking for products to install
    Mar 31 16:27:02 NAME Software Update[209]: Performing preflight
    Mar 31 16:27:02 NAME Software Update[209]: Preparing session
    Mar 31 16:27:02 NAME Software Update[209]: Starting session
    Mar 31 16:27:03 NAME Software Update[209]: PKG: extracting "com.apple.pkg.MacBookProSMCUpdate"
    Mar 31 16:27:03 NAME Software Update[209]: PKG: pre-flight scripts for "com.apple.pkg.MacBookProSMCUpdate"
    Mar 31 16:27:03 NAME Software Update[209]: PKG: pre-install scripts for "com.apple.pkg.MacBookProSMCUpdate"
    Mar 31 16:27:16 NAME Software Update[209]: REQ: moving files into place with shove
    Mar 31 16:27:17 NAME Software Update[209]: PKG: post-install scripts for "com.apple.pkg.MacBookProSMCUpdate"
    Mar 31 16:27:17 NAME Software Update[209]: PKG: post-flight scripts for "com.apple.pkg.MacBookProSMCUpdate"
    Mar 31 16:27:17 NAME Software Update[209]: PKG: writing receipt for "com.apple.pkg.MacBookProSMCUpdate"
    Mar 31 16:27:17 NAME Software Update[209]: REQ: install succeeded
    Mar 31 16:27:18 NAME Software Update[209]: SWU: installing "MacBook Pro SMC Firmware Update, 1.6"
    Mar 31 16:27:20 NAME [0x0-0x1a01a].com.apple.SoftwareUpdate[209]: /: no supported helper partitions to update.
    Mar 31 16:27:20 NAME kextd[10]: updated kernel boot caches
    Mar 31 16:27:20 NAME Software Update[209]: kextcache returned 0
    Mar 31 16:27:20 NAME Software Update[209]: Running /sbin/reboot
    Mar 31 16:27:20 NAME reboot[242]: rebooted by Caithris
    Mar 31 16:27:20 NAME reboot[242]: BOOT_TIME: 1364714840 524942
    Mar 31 16:27:20 NAME mDNSResponder[28]: mDNSResponder mDNSResponder-258.21 (May 26 2011 14:40:13) stopping
    Mar 31 16:27:20 NAME DirectoryService[15]: BUG in libdispatch: 10K549 - 1960 - 0x10004004
    Mar 31 16:27:20 NAME WindowServer[203]: hidd died. Reestablishing connection.
    Mar 31 16:27:20 NAME WindowServer[203]: Unable to create event queue via hidd: (0x10000003)
    Mar 31 16:28:03 localhost com.apple.launchd[1]: *** launchd[1] has started up. ***
    Mar 31 16:29:52 localhost bootlog[47]: BOOT_TIME: 1364714882 0
    Mar 31 16:29:53 localhost mDNSResponder[34]: mDNSResponder mDNSResponder-258.21 (May 26 2011 14:40:13) starting
    Mar 31 16:29:54 localhost configd[13]: network configuration changed.
    Mar 31 16:29:54 NAME configd[13]: setting hostname to "NAME.local"
    Mar 31 16:29:54 NAME com.apple.usbmuxd[27]: usbmuxd-296.4 on Dec 21 2012 at 16:11:14, running 64 bit
    Mar 31 16:29:56 NAME blued[17]: Apple Bluetooth daemon started
    Mar 31 16:29:57 NAME /System/Library/CoreServices/loginwindow.app/Contents/MacOS/loginwindow[35]: Login Window Application Started
    Mar 31 16:29:59 NAME configd[13]: network configuration changed.
    Mar 31 16:30:12: --- last message repeated 2 times ---
    Mar 31 16:30:12 NAME ntpd[24]: time reset +0.227711 s
    Mar 31 16:30:13 NAME loginwindow[35]: Login Window Started Security Agent
    Mar 31 16:30:14 NAME WindowServer[61]: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
    Mar 31 16:30:14 NAME com.apple.WindowServer[61]: Sun Mar 31 16:30:14 NAME.local WindowServer[61] <Error>: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
    Mar 31 16:30:21 NAME SecurityAgent[96]: NSSecureTextFieldCell detected a field editor ((null)) that is not a NSTextView subclass designed to work with the cell. Ignoring...
    Mar 31 16:30:22 NAME loginwindow[35]: Login Window - Returned from Security Agent
    Mar 31 16:30:22 NAME loginwindow[35]: USER_PROCESS: 35 console
    Mar 31 16:30:22 NAME com.apple.launchd.peruser.501[99] (com.divx.agent.postinstall): Unknown key: LimitToSessionType
    Mar 31 16:30:22 NAME com.apple.launchd.peruser.501[99] (com.apple.ReportCrash): Falling back to default Mach exception handler. Could not find: com.apple.ReportCrash.Self
    Mar 31 16:30:32 NAME com.apple.launchd.peruser.501[99] (com.apple.mrt.uiagent[124]): Exited with exit code: 255
    Mar 31 16:30:35 NAME com.apple.launchd.peruser.501[99] (com.apple.Kerberos.renew.plist[125]): Exited with exit code: 1
    Mar 31 16:30:47 NAME mdworker[81]: (Error) SyncInfo: Catalog changed during searchfs too many times -- falling back to fsw search /
    Mar 31 16:36:05 NAME mdworker32[158]: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
    Mar 31 16:36:22 NAME mdworker32[161]: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
    Mar 31 16:36:29 NAME [0x0-0x10010].org.mozilla.firefox[149]: NOTE: child process received `Goodbye', closing down
    Mar 31 16:39:07 NAME mdworker[157]: Warning: unknown JFIF revision number 0.01
    Mar 31 16:39:22 NAME login[182]: USER_PROCESS: 182 ttys000
    Mar 31 16:40:34 NAME /System/Library/CoreServices/CCacheServer.app/Contents/MacOS/CCacheServer[132]: No valid tickets, timing out
    Mar 31 16:40:35 NAME mdworker[157]: Error, could not create MachMessagePort for com.apple.AddressBook.abd
    Mar 31 16:40:37 NAME mdworker[157]: Unable to parse date (<XHTML-STRIPONREPLY>
    </XHTML-STRIPONREPLY>)
    Mar 31 16:40:38 NAME mdworker[157]: Unable to parse date ( S<XHTML-STRIPONREPLY>
    </XHTML-STRIPONREPLY>him to any)
    Mar 31 16:40:41: --- last message repeated 1 time ---
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 1
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 2
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 3
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 4
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 5
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 6
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 7
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 8
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 9
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 10
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 11
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 12
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 13
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 14
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 15
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 16
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 17
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 18
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 19
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 20
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 21
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 22
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 23
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 24
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 25
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 26
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char ^M for PropertyName in line 26
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 26
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char ^M for PropertyName in line 26
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 26
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 1
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 2
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 3
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 4
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 5
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 6
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 7
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 8
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 9
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 10
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 11
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 12
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 13
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 14
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 15
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 16
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 17
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 18
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 19
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 20
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 21
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 22
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 23
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 24
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 25
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 26
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char ^M for PropertyName in line 26
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 26
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char ^M for PropertyName in line 26
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 26
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char ^M for PropertyName in line 26
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 26
    Mar 31 16:41:27 NAME mdworker[157]: Corrupt JPEG data: 1 extraneous bytes before marker 0xd9
    Mar 31 16:41:27 NAME mdworker[157]: JPEG datastream contains no image
    Mar 31 16:41:33: --- last message repeated 1 time ---
    Mar 31 16:41:33 NAME login[182]: DEAD_PROCESS: 182 ttys000
    Mar 31 16:41:50 NAME mdworker[156]: iCal.mdimporter: could not parse ICS file: /Applications/Microsoft Office 2011/Office/OutlookCore.framework/Versions/14/Resources/en.lproj/Timezones.ics
    Mar 31 16:41:51 NAME mdworker32[204]: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
    Mar 31 16:43:41 NAME [0x0-0x10010].org.mozilla.firefox[149]: NOTE: child process received `Goodbye', closing down
    Mar 31 17:07:10 NAME firefox[149]: -deltaZ is deprecated for NSEventTypeMagnify.  Please use -magnification.
    Thanks again- I mean it. It's lousy being stuck away from home when crazy thing happen to your main line of communication!
    -Caithris

    The gray screen with loading bar issue is a at boot fsck (file system check) that has discovered something wrong with your boot drive/partition and was attempting to fix it.
    OS X is booting but can't complete, so that means your hard drive is good, just likely has been either subjected to shock which damaged data on the platters, or bad sectors (the drive is dying if after fixing it, problems occurs again), or something messed something up in the file structure.
    Firefox is currently at 19.02, so it appears your background auto-update has not been occurring, which makes me suspect the machine's data is broken in some manner or you have malware on the machine blocking the updates.
    Your problems are multiple, in your case I advise a complete erase and install.
    1: If you have a backup of your user data on a external storage drive (not TimeMachine as it might be corrupted and compromised with malware it's just going to restore back) then your good, else you have to do this.
    Create a data recovery/undelete external boot drive
    Copy your data to a blank plain jane external storage drive as you want no executable files on it when you connect to the cleaned machine later.
    2: Once your data is safely copied (copy visible files manually and what you know is good, not folders that can contain invisible malware programs!) then disconnect the drive(s)
    3: Next assume all writeable media is contaminated with malware and treat as so. Even if you erased it.
    4: Stick in your 10.6 install disk and reboot holding the c or option key down. You want Disk Utility and you want to select the ENTIRE internal drive and MUST USE the Security Option > Zero All Data (unless your in the military then use 7x erase, do not use 35x as it will take weeks and is unnecessary)
    The Zero/7x erase will do two things, do a low level format and erradicate everything (including hidden stuff and deleted files) also will map off any failing sectors on the hard drive.
    5: Follow the procedure here to install 10.6
    How to erase and install Snow Leopard 10.6
    6: Reboot the machine twice, then once you set up the machine (using a alias of course and not allowing registration), use a secured network and IMMEDIATLY Software update to 10.6.8, if you can download the 10.6.8 Combo update on another secure machine to a (new) USB thumb drive and install it on the clean Mac, do that instead.
    WiFi security issues, at home and WiFi hotspots
    https://support.apple.com/kb/DL1399
    Still run Software update afterwards as Apple might not have fully updated the combo update yet.
    7: Once you machine is secure, download the free ClamXav and run a scan on the external storage drive with just your files, perhaps one or more PDF's or other files are not what they seem to be.
    8: Make sure to install fresh copies of software from original sources and not from rewriteable media, update them to be current. Malware can be hidden in copies of programs.
    9: Trash all your rewritable media, or use a Linux PC or Linux Mint in a virtual machine (VirtualBox) on another computer like Windows to scrub and reformat all the rewritable media before attaching them to the clean Mac. You have to make sure it's getting the entire media.
    10: Once your machine is set back up, then make clones and time and date them.
    Most commonly used backup methods
    If your still having problems with the machine, it's likley a failing hard drive and you will have to replace it and repeat the steps above pretty much.
    Really it's best to replace the drive in the interest of security.
    Install/upgrade RAM or storage drive in Mac's
    For performance of Snow Leopard, check out this tip
    For Snow Leopard Speed Freaks
    Your overseas, if your in a foriegn country you have to assume FinSpy is being installed on your machine (uses a older iTunes verison "update" to get on) or there is other tricks via the ISP to install something on your machine. So mix things up and don't stick any old USB you see laying around into your Mac.
    https://discussions.apple.com/community/notebooks/macbook_pro?view=documents#/

  • Mac Pro stuck on gray screen after installing software for a new keyboard

    I am having a huge issue with my very important work computer! For a few weeks, my Mac has been freezing on the gray screen during start up. Since I had two external hard drives plugged in, I would unplug one of them and the Mac would always restart correctly once one was unplugged. Well today I was installing software for a new keyboard and the mac prompted me to restart. Once I restarted, the gray screen came up again and no matter what I did it would not start up correctly again. I tried unplugging everything except the keyboard and monitor and nothing works. I tried ejecting the crash-causing CD with the keyboard using all of the commands I found on this forum board and nothing worked. I saw forums about manually ejecting the CD by pushing a pin-hole but I cannot find that pinhole anywhere! Then again, the CD might not even be the problem but since the computer gave me the gray screen of death right after using the CD I am thinking that it is the problem. I use this computer for editing a TV show and creating websites so there is a ton of files on it and I need to get it up and running again ASAP. Any suggestions would be appreciated and I am sure by now you can tell that I am not a Mac expert so please dumb it down for me. Thank you!!

    I would start by breaking your thoughts and sentences out from one long paragraph.
    Start at the basics.
    Always have backups.
    One at least that is a spare boot system you can use.
    Clone your system. SuperDuper does a great job for only $29
    Boot from another hard drive or last OS X DVD
    Repair your drive with Apple Disk Utility along with 3rd party disk maintenance and repair
    Hold Option key until the boot manager, then hold mouse to open optical drive.
    You can hold mouse on startup and it will eject also.
    Hold and continue to hold Shift key during startup to repair the boot drive in minimal fashion.
    What device and driver? hint: never use CD, just go online as the CD is usually out of date anyway.
    Fill in Mac OS X version and more about hardware would help in posts and in your profile signature.
    http://www.shirt-pocket.com/SuperDuper/SuperDuperDescription.html
    http://www.macintouch.com/readerreports/harddrives/index.html#d12aug2010
    http://www.alsoft.com/DiskWarrior

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  • Dual 1Ghz PowerMac G4 gray screen after booting

    Greetings
    Please can someone give me some more ideas to try, my G4 dual 1Gz system boots in to the operating system fine but after a while I get the gray screen crash, can be quick can be a while. I've reinstalled the operating system after formatting the HHD, I've done the disk utility repairs, I've swapped out the video card and the ram and its still doing it.
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    James

    Sounds like it's going out.
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    DALE

  • Beach Ball of Death, Dark Gray Screen after Clean OS ReInstall- Please Help

    My 13" MBP is less than two months old.
    I read online somewhere that a company that buys large quantities of Macs has a strategy for combating the industry standard 5% hard drive failure in new notebooks. It said something along the lines of performing a clean install / reformat of OS X was a good idea to see if any problems arise- then the HD would likely have problems in the near future, etc...
    Being the nerd that I am I performed a clean install on my MBP. I had just performed one the day before on my other Mac (which worked perfectly).
    First of all, my MBP took roughly 15 minutes to boot from the disk (to begin the reinstall). Actually one time I gave it over 20 minutes and it never did load. Once I finally got to the Language select screen it froze, clicking the continue arrow did nothing and I couldn't even choose another language. So I shut down and tried again. The DVD doesn't look scratched. Is my drive less than stellar?
    This time, it worked, albeit, it took much longer to install than my lesser powered Mac Mini. OS X notified me that the installation was successful and that it now simply needed to restart. Upon restart I was greeted with a dark gray screen and mouse cursor spinning beach ball (that responded to trackpad).
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    I took my MBP to a local authorized service provider and they took it, and called me back in a few hours. I asked what they did to fix it, and they skillfully dodged the question. They said it should be good now, that it passed all hardware tests, but to let them know if it happened again.
    Since then it's been running okay. As a nerd it's a bit bothersome to know that I can't perform a clean install when I see fit- and that if I did, I'd have to take it into Apple Care again in the future, and once Apple Care runs out than a clean install just isn't an option.
    It boots up just as fast, but when it gets passed the white screen with the Apple logo... when the desktop is loading I noticed that it stays at the flash of the solid blue desktop a bit longer than usual (the second before it loads your desktop bg image). It also seems that fully loading all of the top right menu bar items takes a bit longer than before.
    Also, not sure if the hard drive's sudden motion sensor is going haywire. But randomly, the hard drive will make a singular faint "thud / click" noise. Very faint. But it's not your usual "reading data from the HD" hard drive thrashing noise you hear when you open an app / file. It's a single, more sudden noise, but like I said it is fairly quiet- I hear it when I have literally nothing running except this Safari window. This is something I didn't notice the first few weeks with the MBP.
    Also in system profiler, the battery's condition was never good, but only "Normal." I did calibrate my battery one of the first days I had it.
    Here's some coconutBattery info:
    Current Battery Capacity: 5588 mAh
    Original Battery Capacity: 5770 mAh
    Which is 96%.
    Load cycles: 10
    Anyways, curious if anyone has any ideas about my inability to perform a clean install and successfully boot up? I don't see any reason why it should have taken THAT long to boot from the disk, frozen in several random spots throughout, and then not be able to boot up.
    The HD noises aren't a huge deal just a bit concerning, and admittedly the battery info is just nerdy paranoia. Just curious what's going on with my MBP. Is there anything I can do, or should read?

    Hi simplecoder13,
    I perform a similar process on all the HDs that I buy, only I take it a step further. I'll run a single pass erase on drives under 500GB and a seven pass erase on drives larger than 500GB and ones that are deemed "mission critical." Here's an interest metric, though.
    Since 01/01/10 on laptop drives (Seagate, Western Digital, Hitachi)
    +HDs purchases - 461+
    +Drives > 500GB - 119+
    +Drives < 500GB - 342+
    +Drives that fail zero test - 13+
    +Drives that pass zero test, fail within 30 days - 2+
    +Drives that pass zero test, fail within 60 days - 0+
    +Drives that pass zero test, fail within 90 days - 3+
    +Drives that pass zero test, fail within 180 days - 4+
    +Total drive failures within 6 months - 22 (4.77%) ~ 5%+
    I don't have a manufacturer break down, I suppose I should start logging that more closely. Anyway...
    I have a new MacBook Pro (13" @ 2.4GHz) and booting off the installation disc, from selecting the installer disc via the boot manager to the language selection screen is ~ 6 mins and 44 seconds. I use that as an average, I did it over 10 restarts but it was a pretty fair assessment. The fact that the installer is freezing is definitely cause for alarm, that's not normal or to be expected. Process of elimination would tell me the following:
    1.) The disc is bad
    2.) The optical drive is bad
    My understanding of the installer is the HD isn't initially accessed during the installer until you choose an install location (at which point it's mount point is verified).
    Regarding the battery, your full charge capacity is going to bounce around the first couple of months, usually anywhere from 250-400 mAh. I noticed sporadic reporting until I reached the 50 cycle mark (or around 6 months based on usage). That being said, I don't see any problems or cause for alarm with the information you've reported.

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