Blue or grey screen on boot

Mac Pro 1,1; 10.6.4
On attempting to start up recently I got a screen in alternating shades of blue.
Trying to boot to a bootable CD gives me a 'you need to restart' grey screen.
Booting to the diagnostic works and finds no problems.
Booting in firewire target mode allows access to the HD and repaired some errors with diskutility but did not change symptoms. Subsequent checks show no errors.
Booting to an ubuntu livecd worked fine with generic graphics drivers (up to date drivers available but require a reboot).
Booting into safe mode has the blue screens alternating with a black screen with a white rectangle in the top left (about the size of an old terminal cursor).
Zapping PRAM doesnt seem to change anything.
Recent upgrades include +4GB RAM which I have removed and errors remain with the original 1GB RAM (2x512)
I have also replaced the graphics card recently, GT 8800 stopped working and I replaced it with another GT 8800.
The help pages on blue and grey screens seem to be mutually exclusive but both discuss removing peripherals and non Apple hardware.
Per above, I have tried the diagnostic/safe/boot CD options mentioned in both and the only option I cant try is removing the graphics card (unless there is a way to test a successful boot without a screen?)
I suspect it is either a graphics fault which ubuntu doesnt mind but OSX does, or a more complex disk corruption.
The next option appears to be erasing the disk with firewire/diskutil and attempting a fresh install (not sure why this would remedy the kernel panic on booting from CD).
Some logs have been populated in Library/Logs/DiagnosticReports, I can post fragments as required but am unable to interpret atm.
Any suggestion appreciated.

HI,
Trying to boot to a bootable CD gives me a 'you need to restart' grey screen.
That is what is referred to as a kernel panic.
Go here for help to Resolve Kernel Panics
Carolyn

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What happens between the chime & the grey screen on boot?

Hi,
My Mac Pro has recently started taking up to 30secs to reach the grey screen when booting. The chime happens shortly after (re)starting, and then there's a significant pause, where nothing seems to happen (even the Apple Display stays in stand-by mode), before the HDD starts reading and the grey screen appears. I tried using Verbose mode, but the data it prints to screen doesn't start until after the long pause, so…
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Hi,
My issue has been solved, apparently by a combination of a PRAM reset and re-selecting the startup disk in System Preferences. My machine now moves from chime to Apple logo almost instantaneously
The AppleCare representative was thorough and walked me through various steps that narrowed down the issue, and his hesitant conclusion was that somehow, as hatter suggested, the Mac was taking its time to find the appropriate boot device - possibly as a result of a change I had made in my BootCamp partition (Windows 7) or as a result of a previous PRAM reset (as hatter suggested).
Case closed! Yay!
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EDIT: So, Japamac, it was presumably the "system selection" part of the post-Chime process that was causing the delay. Didn't see your post till I returned to respond with this post, but thanks for the effort anyway
Message was edited by: SiRGadaBout

IMBP 13" (2009 revision) display a prohibition sign w/grey screen on boot

Hello,
I'm new to this OS, which is a iMBP 13" (2009 revision). I'm experiencing abnormal boot sequence. The bootup screen display a prohibition sign with a grey screen upon boot after installing Security Update 2010-001 for Snow Leopard. There is no error message I can write down nor excessive fan noise coming out from the laptop.
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Message was edited by: TonySNZ

Hello Tony from New Zealand (great place, I visited once):
Welcome to Apple discussions.
Take a look at this article to see if it helps you fix the problem:
http://support.apple.com/kb/TS2570
If it does not, I think I would reinstall OS X 10.6 (upgrade from your software install DVD) over your existing system. Then I would run software update to bring everything to current levels.
A good backup before any software change is always a very good idea (I use both Time Machine and SuperDuper).
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Booting in single user mode to trouble shoot grey screen the boot stops at "CODE SIGNING .... clearing CS_VALID" will not command c past - stuck

booting in single user mode to trouble shoot grey screen the boot stops at "CODE SIGNING .......... clearing CS_VALID" - cannot command C past - just stuck

Hi opjml0,
Welcome to the Apple Support Communities!
If your Macbook is starting up to the gray screen, I suggest the steps in the following article.
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/ts2570
I hope this helps,
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Blue to black screen at boot up.

I'm running 10.6.8 Mac Pro and getting blue to black screen at boot up. I am only able to log in by safe mode only, please help...

Do you get:
Chime
gray screen
Dark Apple
Spinner
Spinner spins for the usual amount of time
screen goes blue or black at the point where you would normally login?
That is exactly when the graphics card is shifted to automatic. Although that also is the point when added kernel extensions have been loaded and are made active, users report this symptom often correlates with graphics card failure.
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Emac 1.25ghz 1gb (i think 10.4.11) grey screen/no boot.

Hi all,
eMac wont boot, just sits on the grey screen (with no spinning loading thing, no folder with question mark or anything). I cant tell if it is chiming (the speakers have never worked on it). It doesn't sound like the HD is spinning up (If i remember right emacs had fans so that is all I can here) - but am i right in thinking if the HD was broken it would go to the grey screen with folder with question mark?
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hmmmm.
Turns out it wasn't as simple as that....
After turning it back on with the stick of after market ram out, it booted up lovely into osx, ran nice. a couple of hours later the owner plugged her ipod into it - itunes said that the ipod was not registered to that mac (even tho the ipod has only ever been used with this machine). So I got called back to look at this. I clicked the 'sync' button in her itune's library and the screen went all blue (everything disappeared including the cursor).
I left it like it for a couple of mins - no change, held in the power button, turned it off then back on again, back to the gray screen from before, No boot. unplugged the ipod and her drawing pad thinggy.
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thanks again,
Olly
Message was edited by: oliver newman

How can I get rid of The Grey screen and boot my macbook?

Today I was on my MacBook Pro (bought July 2011) and it went to a blank blue screen. I powered it off and tried to restart it. It loaded the apple and spinning circle but it went to a grey screen and froze there. I've read and tried a lot of different things already but nothing has worked. I did the hardware test and it found no problems. I tried to safeboot it. I tried everything on here: http://support.apple.com/kb/TS2570 except the last suggestion (I'd rather not have to lose all my files unless absolutely nesseccary). I also tried the "hold Command + R keys" to try and get to utilities. Anything else out there that I could try? Not sure what the exact operating system is either.

I wouldn't assume that's the hard drive. The fact that the screen turned blue all of a sudden isn't necessarily an indication of a hard drive failure. Check out this post I made yesterday:
https://discussions.apple.com/message/21756819#21756819
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My point is that you need to confirm what the source of the problems are. If there's a logic board problem, your drive and data may be OK. If the drive is bad, some of it may still be recoverable. The problem may very well be drive related, but I wouldn't go out and start throwing money at new parts without first confirming what the cause of the problems is.
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Updated to Tiger, stuck on grey screen BUT boots fine with option key

I've searched the forum and found many other similar threads. But no real answers for my particular problem. Here it is. iMac 800 MHz G4, 512 RAM was on 10.3.9. Updated to 10.4.5. Then booted from a firewire hard drive and fixed permissions and ran Disk Warrior. Now when I try to boot up normally it just stays on a blank grey screen. No Apple logo. No spinning wheel, nothing. Weird thing is it boots up fine if I hold down the option key at start up and select the hard drive. So, I've done that and repaired permissions and run disk utility. Says everything is OK. Even zapped the PRAM. But still, only way to get it to boot is by holding option key and choosing hard drive. Any ideas?

Hi Steve, What other start up options are you seeing when you boot with the 'Option' key? Have you tried a 'Safe Boot"? Hold down the 'Shift' key while restarting until (hopefully) you see the spinning gear wheel. Wait while it restarts, this takes a lot longer. If you can boot into 'Safe mode' then in System Preferences>System>Start up disk, make sure that your hard drive is selected.
If you can't boot into 'Safe mode' (you should be able to) then when you have booted with the 'Option' key, follow the 'System Preferences' advice above. Select your hard drive & 'Restart'.
Also have a look at
Dr Smoke's Troubleshooting Startup and Login Items.
For future reference, bookmark his X-Lab home page. There is a wealth of helpful information. Obviously he'd like you buy his 'Troubleshooting' e-Book, but there's loads there for free.
As Dr Smoke would say: "Good luck! "
Have fun too!
An  a day...
Adrian
ibook G4: 768mb, iMac 17" G4:768mb (10.3.9) Mac OS X (10.4.4) Belkin Wireless F5D7632

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Resetting PRAM and NVRAM is not working
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Grey screen on boot problem

Hi There,
I have a clean Vista install on a late 2008 Macbook aluminum. Some issues but love the combination. However, when booting the computer starts with a grey screen that lasts a long time before booting Vista. Feels like the software is still looking for a OSX partition. Anyone know of a registry entry/ fix for this?
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BaliApple

Hi.
Bali i'm new to MBP too but as far as i know there isn't any registry entry the registry part belongs to windows it has nothing to do with that grey screen. I think it might be the EFI but i dont't know. I'm still learning . I have the same problem in a way. When i power on the MBP that grey screen apears for more then a minute. After that a black screen with an "_" in the left side of the screen for another ~3m. I have tried PRAM reset and no result. The weird thing is that i haven`t done anything i only reinstalled my OS ( typically windows ). I haven`t touched the EFI partition either. What else can i try. Ow and one more question: If i upgrade the HDD how can this influence the MBP considering that it won't have an EFI partition anymore. Cheers.
by the way here is some info:
BIOS Version: Apple Inc. MBP41.88Z.00C1.B03.0802271651, 2/27/2008
System Model: MacBookPro4,1

Grey screen at boot up and then hang up

I've tried to use my 2008 iMac running MAC OS 10.7.5 this morning and it won't boot. I get to the grey screen where it would normally display the apple logo and then the login prompt, but hangs up before that point.
I've sucessfully booted it into safe mode and all the hardware checks I've performed suggest that everything is ok.
Via safe mode I've found the following boot information - located in the "/var/log/system.log" file...
Feb 25 10:08:28 localhost bootlog[0]: BOOT_TIME 1361786908 0
Feb 25 10:08:30 localhost com.apple.launchd[1]: *** launchd[1] has started up. ***
Feb 25 10:08:39 localhost com.apple.launchd[1] (com.apple.powerd): Unknown value for key POSIXSpawnType: Interactive
Feb 25 10:08:39 localhost com.apple.launchd[1] (com.apple.sandboxd): Unknown value for key POSIXSpawnType: Interactive
Feb 25 10:08:51 localhost UserEventAgent[11]: starting CaptiveNetworkSupport as SystemEventAgent built Jun 13 2011 17:29:21
Feb 25 10:08:51 localhost UserEventAgent[11]: CaptiveNetworkSupport:CreateInterfaceWatchList:2788 WiFi Devices Found.
Feb 25 10:08:51 localhost UserEventAgent[11]: CaptiveNetworkSupport:CaptivePublishState:1211 en1 - PreProbe
Feb 25 10:08:51 localhost UserEventAgent[11]: CaptiveNetworkSupport:CaptiveSCRebuildCache:81 Failed to get service order
Feb 25 10:08:52: --- last message repeated 1 time ---
Feb 25 10:08:51 localhost UserEventAgent[11]: CaptiveNetworkSupport:CaptivePublishState:1211 en1 - PreProbe
Feb 25 10:08:51 localhost UserEventAgent[11]: CaptiveNetworkSupport:CaptiveSCRebuildCache:81 Failed to get service order
Feb 25 10:08:52: --- last message repeated 1 time ---
Feb 25 10:08:52 localhost UserEventAgent[11]: CertsKeychainMonitor: configuring
Feb 25 10:08:53 localhost UserEventAgent[11]: CaptiveNetworkSupport:CaptiveSCRebuildCache:81 Failed to get service order
Feb 25 10:08:53: --- last message repeated 1 time ---
Feb 25 10:08:53 localhost UserEventAgent[11]: CaptiveNetworkSupport:CaptivePublishState:1211 en1 - PreProbe
Feb 25 10:08:53 localhost airportd[28]: _processDLILEvent: en1 attached (down)
Feb 25 10:08:53 localhost mDNSResponder[12]: mDNSResponder mDNSResponder-320.16 (Jul 19 2012 21:07:07) starting OSXVers 11
Feb 25 10:08:54 ze_monkey-imac configd[16]: setting hostname to "ze_monkey-imac.local"
Feb 25 10:08:54 ze_monkey-imac configd[16]: network configuration changed.
Feb 25 10:08:55 ze_monkey-imac systemkeychain[40]: done file: /var/run/systemkeychaincheck.done
Feb 25 10:08:55 ze_monkey-imac configd[16]: network configuration changed.
Feb 25 10:08:55: --- last message repeated 1 time ---
Feb 25 10:08:55 ze_monkey-imac mDNSResponder[12]: D2D_IPC: Loaded
Feb 25 10:08:55 ze_monkey-imac mDNSResponder[12]: D2DInitialize succeeded
Feb 25 10:08:57 ze_monkey-imac UserEventAgent[11]: ServermgrdRegistration cannot load config data
Feb 25 10:08:58 ze_monkey-imac configd[16]: network configuration changed.
Feb 25 10:08:58 ze_monkey-imac UserEventAgent[11]: CaptiveNetworkSupport:CaptivePublishState:1211 en1 - Probe
Feb 25 10:08:58 ze_monkey-imac UserEventAgent[11]: CaptiveNetworkSupport:CNSPreferences:60 Creating new preferences
Feb 25 10:08:58 ze_monkey-imac UserEventAgent[11]: CaptiveNetworkSupport:CaptiveStartDetect:2343 Bypassing probe on ze_monkey-wireless because it is protected and not on the exception list
Feb 25 10:08:58 ze_monkey-imac UserEventAgent[11]: CaptiveNetworkSupport:CaptivePublishState:1211 en1 - Unknown
Feb 25 10:08:58 ze_monkey-imac configd[16]: network configuration changed.
Feb 25 10:09:01 ze_monkey-imac com.apple.pfctl[66]: No ALTQ support in kernel
Feb 25 10:09:01 ze_monkey-imac com.apple.pfctl[66]: ALTQ related functions disabled
Feb 25 10:09:02 ze_monkey-imac com.apple.ucupdate.plist[59]: ucupdate: Checked 1 update, no match found.
Feb 25 10:09:03 ze_monkey-imac VMware Fusion 683826[90]: Starting VMware Fusion:
Feb 25 10:09:03 ze_monkey-imac com.vmware.launchd.vmware[87]: Feb 25 10:09:03 ze_monkey-imac.local VMware Fusion 683826[90] <Notice>: Starting VMware Fusion:
Feb 25 10:08:56 ze_monkey-imac com.apple.usbmuxd[58]: usbmuxd-296.3 on Jul 25 2012 at 00:28:37, running 64 bit
Feb 25 10:08:57 ze_monkey-imac ntpd[54]: proto: precision = 1.000 usec
Feb 25 10:08:58 ze_monkey-imac loginwindow[72]: Login Window Application Started
Feb 25 10:08:58 ze_monkey-imac mds[70]: (Normal) FMW: FMW 0 0
Feb 25 10:09:02 ze_monkey-imac XProtectUpdater[56]: Ignoring new signature plist: Not an increase in version
Feb 25 10:09:02 ze_monkey-imac com.apple.launchd[1] (com.apple.xprotectupdater[56]): Exited with code: 252
Feb 25 10:09:12 ze_monkey-imac loginwindow[72]: **DMPROXY** Found `/System/Library/CoreServices/DMProxy'.
Feb 25 10:09:14 ze_monkey-imac airportd[28]: _doAutoJoin: Already associated to “ze_monkey-wireless”. Bailing on auto-join.
Feb 25 10:09:16 ze_monkey-imac loginwindow[72]:
        O3REQUIRE FAILED: ret == 0
           - file: /SourceCache/BezelServices/BezelServices-232.3/Utilities/Utilities.c
           - line: 91
Feb 25 10:09:16 ze_monkey-imac loginwindow[72]: Failed to lookup Bezel UI Server port: Bootstrap Unknown Service.
Feb 25 10:09:16 ze_monkey-imac loginwindow[72]: Login Window Started Security Agent
Feb 25 10:09:16 ze_monkey-imac com.apple.launchctl.LoginWindow[110]: com.apple.findmymacmessenger: Already loaded
Feb 25 10:09:17 ze_monkey-imac SecurityAgent[115]: Echo enabled
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I'm not sure what the "O3REQUIRE FAILED" relates to and also the control characters at the end!?! Does anyone know?
Also does anyone know how to fix this?
Any help you can provide would be useful.
Thanks

Ok, I've uninstalled both VMware and MacFUSE using the documented procedures taken from official websites.
I've rebooted and I still have the same problem... hangs before the login screen appears. I can still login via safe mode however.
Do you want me to post the output from the three steps again?
F.Y.I. Latest contents of "/var/log/System.log" from hang up ->
Mar 1 11:06:23 localhost bootlog[0]: BOOT_TIME 1362135983 0
Mar 1 11:06:25 localhost com.apple.launchd[1]: *** launchd[1] has started up. ***
Mar 1 11:06:37 localhost com.apple.launchd[1] (com.apple.powerd): Unknown value for key POSIXSpawnType: Interactive
Mar 1 11:06:37 localhost com.apple.launchd[1] (com.apple.sandboxd): Unknown value for key POSIXSpawnType: Interactive
Mar 1 11:06:44 localhost UserEventAgent[11]: starting CaptiveNetworkSupport as SystemEventAgent built Jun 13 2011 17:29:21
Mar 1 11:06:44 localhost UserEventAgent[11]: CaptiveNetworkSupport:CreateInterfaceWatchList:2788 WiFi Devices Found.
Mar 1 11:06:44 localhost UserEventAgent[11]: CaptiveNetworkSupport:CaptivePublishState:1211 en1 - PreProbe
Mar 1 11:06:44 localhost UserEventAgent[11]: CaptiveNetworkSupport:CaptiveSCRebuildCache:81 Failed to get service order
Mar 1 11:06:44: --- last message repeated 1 time ---
Mar 1 11:06:44 localhost UserEventAgent[11]: CaptiveNetworkSupport:CaptivePublishState:1211 en1 - PreProbe
Mar 1 11:06:44 localhost UserEventAgent[11]: CaptiveNetworkSupport:CaptiveSCRebuildCache:81 Failed to get service order
Mar 1 11:06:45: --- last message repeated 1 time ---
Mar 1 11:06:45 localhost UserEventAgent[11]: CertsKeychainMonitor: configuring
Mar 1 11:06:47 localhost airportd[28]: _processDLILEvent: en1 attached (down)
Mar 1 11:06:47 localhost UserEventAgent[11]: CaptiveNetworkSupport:CaptivePublishState:1211 en1 - PreProbe
Mar 1 11:06:47 localhost mDNSResponder[12]: mDNSResponder mDNSResponder-320.16 (Jul 19 2012 21:07:07) starting OSXVers 11
Mar 1 11:06:48 ze_monkey-imac configd[16]: setting hostname to "ze_monkey-imac.local"
Mar 1 11:06:48 ze_monkey-imac configd[16]: network configuration changed.
Mar 1 11:06:48 ze_monkey-imac systemkeychain[40]: done file: /var/run/systemkeychaincheck.done
Mar 1 11:06:49 ze_monkey-imac configd[16]: network configuration changed.
Mar 1 11:06:49: --- last message repeated 1 time ---
Mar 1 11:06:49 ze_monkey-imac mDNSResponder[12]: D2D_IPC: Loaded
Mar 1 11:06:49 ze_monkey-imac mDNSResponder[12]: D2DInitialize succeeded
Mar 1 11:06:50 ze_monkey-imac UserEventAgent[11]: ServermgrdRegistration cannot load config data
Mar 1 11:06:51 ze_monkey-imac configd[16]: network configuration changed.
Mar 1 11:06:51 ze_monkey-imac UserEventAgent[11]: CaptiveNetworkSupport:CaptivePublishState:1211 en1 - Probe
Mar 1 11:06:51 ze_monkey-imac UserEventAgent[11]: CaptiveNetworkSupport:CNSPreferences:60 Creating new preferences
Mar 1 11:06:51 ze_monkey-imac UserEventAgent[11]: CaptiveNetworkSupport:CaptiveStartDetect:2343 Bypassing probe on ze_monkey-wireless because it is protected and not on the exception list
Mar 1 11:06:51 ze_monkey-imac UserEventAgent[11]: CaptiveNetworkSupport:CaptivePublishState:1211 en1 - Unknown
Mar 1 11:06:51 ze_monkey-imac configd[16]: network configuration changed.
Mar 1 11:06:54 ze_monkey-imac com.apple.ucupdate.plist[59]: ucupdate: Checked 1 update, no match found.
Mar 1 11:06:54 ze_monkey-imac com.apple.pfctl[66]: No ALTQ support in kernel
Mar 1 11:06:54 ze_monkey-imac com.apple.pfctl[66]: ALTQ related functions disabled
Mar 1 11:06:55 ze_monkey-imac launchdadd[21]: FAILURE: Could not send MIG reply: 0x10000003
Mar 1 11:06:56 ze_monkey-imac com.apple.usbmuxd[58]: usbmuxd-296.4 on Dec 21 2012 at 16:11:14, running 64 bit
Please also find attached the contects of the "/var/log/kernel.log" file in parallel. Not sure whether this is helpful?
Mar 1 11:06:41 localhost kernel[0]: Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64
Mar 1 11:06:41 localhost kernel[0]: vm_page_bootstrap: 1007088 free pages and 33296 wired pages
Mar 1 11:06:41 localhost kernel[0]: kext submap [0xffffff7f80736000 - 0xffffff8000000000], kernel text [0xffffff8000200000 - 0xffffff8000736000]
Mar 1 11:06:41 localhost kernel[0]: zone leak detection enabled
Mar 1 11:06:41 localhost kernel[0]: standard timeslicing quantum is 10000 us
Mar 1 11:06:41 localhost kernel[0]: mig_table_max_displ = 73
Mar 1 11:06:41 localhost kernel[0]: AppleACPICPU: ProcessorId=0 LocalApicId=0 Enabled
Mar 1 11:06:41 localhost kernel[0]: AppleACPICPU: ProcessorId=1 LocalApicId=1 Enabled
Mar 1 11:06:41 localhost kernel[0]: calling mpo_policy_init for TMSafetyNet
Mar 1 11:06:41 localhost kernel[0]: Security policy loaded: Safety net for Time Machine (TMSafetyNet)
Mar 1 11:06:41 localhost kernel[0]: calling mpo_policy_init for Sandbox
Mar 1 11:06:41 localhost kernel[0]: Security policy loaded: Seatbelt sandbox policy (Sandbox)
Mar 1 11:06:41 localhost kernel[0]: calling mpo_policy_init for Quarantine
Mar 1 11:06:41 localhost kernel[0]: Security policy loaded: Quarantine policy (Quarantine)
Mar 1 11:06:41 localhost kernel[0]: Copyright (c) 1982, 1986, 1989, 1991, 1993
Mar 1 11:06:41 localhost kernel[0]: The Regents of the University of California. All rights reserved.
Mar 1 11:06:41 localhost kernel[0]: MAC Framework successfully initialized
Mar 1 11:06:41 localhost kernel[0]: using 16384 buffer headers and 10240 cluster IO buffer headers
Mar 1 11:06:41 localhost kernel[0]: IOAPIC: Version 0x11 Vectors 64:87
Mar 1 11:06:41 localhost kernel[0]: ACPI: System State [S0 S3 S4 S5]
Mar 1 11:06:41 localhost kernel[0]: PFM64 (36 cpu) 0xf10000000, 0xf0000000
Mar 1 11:06:41 localhost kernel[0]: [ PCI configuration begin ]
Mar 1 11:06:41 localhost kernel[0]: console relocated to 0xf10030000
Mar 1 11:06:41 localhost kernel[0]: PCI configuration changed (bridge=2 device=2 cardbus=0)
Mar 1 11:06:41 localhost kernel[0]: [ PCI configuration end, bridges 5 devices 18 ]
Mar 1 11:06:41 localhost kernel[0]: AppleIntelCPUPowerManagement: (built 16:32:09 Aug 23 2012) initialization complete
Mar 1 11:06:41 localhost kernel[0]: FireWire (OHCI) Lucent ID 5901 built-in now active, GUID 00254bfffea158e2; max speed s800.
Mar 1 11:06:41 localhost kernel[0]: USBMSC Identifier (non-unique): 575845393038544E34363432 0x1058 0x704 0x105
Mar 1 11:06:41 localhost kernel[0]: mbinit: done [64 MB total pool size, (42/21) split]
Mar 1 11:06:41 localhost kernel[0]: Pthread support ABORTS when sync kernel primitives misused
Mar 1 11:06:41 localhost kernel[0]: com.apple.AppleFSCompressionTypeZlib kmod start
Mar 1 11:06:41 localhost kernel[0]: com.apple.AppleFSCompressionTypeDataless kmod start
Mar 1 11:06:41 localhost kernel[0]: com.apple.AppleFSCompressionTypeZlib load succeeded
Mar 1 11:06:41 localhost kernel[0]: com.apple.AppleFSCompressionTypeDataless load succeeded
Mar 1 11:06:41 localhost kernel[0]: AppleIntelCPUPowerManagementClient: ready
Mar 1 11:06:41 localhost kernel[0]: BTCOEXIST off
Mar 1 11:06:41 localhost kernel[0]: wl0: Broadcom BCM432b 802.11 Wireless Controller
Mar 1 11:06:41 localhost kernel[0]: 5.106.198.19
Mar 1 11:06:41 localhost kernel[0]: [IOBluetoothHCIController::setConfigState] calling registerService
Mar 1 11:06:41 localhost kernel[0]: rooting via boot-uuid from /chosen: 2EEFC1E1-687B-3DE5-A5B3-5C489A13EB53
Mar 1 11:06:41 localhost kernel[0]: Waiting on <dict ID="0"><key>IOProviderClass</key><string ID="1">IOResources</string><key>IOResourceMatch</key><string ID="2">boot-uuid-media</string></dict>
Mar 1 11:06:41 localhost kernel[0]: Got boot device = IOService:/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/SATA@B/AppleMCP79AHCI/PR T0@0/IOAHCIDevice@0/AppleAHCIDiskDriver/IOAHCIBlockStorageDevice/IOBlockStorageD river/Hitachi HDT721064SLA360 Media/IOGUIDPartitionScheme/Customer@2
Mar 1 11:06:41 localhost kernel[0]: BSD root: disk0s2, major 14, minor 2
Mar 1 11:06:41 localhost kernel[0]: Kernel is LP64
Mar 1 11:06:44 localhost kernel[0]: NVEthernet: Ethernet address 00:25:4b:a1:58:e2
Mar 1 11:06:44 localhost kernel[0]: AirPort_Brcm4331: Ethernet address 00:25:4b:8c:0a:c3
Mar 1 11:06:44 localhost kernel[0]: IO80211Controller::dataLinkLayerAttachComplete(): adding AppleEFINVRAM notification
Mar 1 11:06:44 localhost kernel[0]: IO80211Interface::efiNVRAMPublished():
Mar 1 11:06:47 localhost kernel[0]: in func createVirtualInterface ifRole = 1
Mar 1 11:06:47 localhost kernel[0]: Created virtif 0xffffff800c2aa600 p2p0
Mar 1 11:06:48 localhost kernel[0]: NVDANV50HAL loaded and registered.
Mar 1 11:06:48 localhost kernel[0]: Previous Shutdown Cause: -128
Mar 1 11:06:48 localhost kernel[0]: SMC::smcInitHelper ERROR: MMIO regMap == NULL - fall back to old SMC mode
Mar 1 11:06:48 localhost kernel[0]: DSMOS has arrived
Mar 1 11:06:48 localhost kernel[0]: 00000000 00000020 NVEthernet::setLinkStatus - not Active
Mar 1 11:06:48 ze_monkey-imac kernel[0]: [AGPM Controller] build GPUDict by Vendor10deDevice0655
Mar 1 11:06:48 ze_monkey-imac kernel[0]: SMC::smcReadKeyAction ERROR: smcReadData8 failed for key BEMB (kSMCKeyNotFound)
Mar 1 11:06:48 ze_monkey-imac kernel[0]: AirPort: Link Down on en1. Reason 1 (Unspecified).
Mar 1 11:06:49 ze_monkey-imac kernel[0]: en1: 802.11d country code set to 'US'.
Mar 1 11:06:49 ze_monkey-imac kernel[0]: en1: Supported channels 1 2 3 4 5 6 7 8 9 10 11 36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140 149 153 157 161 165
Mar 1 11:06:49 ze_monkey-imac kernel[0]: [ffffff800c29ec00][BNBTrackpadDevice::init][70.12] init is complete
Mar 1 11:06:49 ze_monkey-imac kernel[0]: [ffffff800c29ec00][BNBTrackpadDevice::handleStart][70.12] returning 1
Mar 1 11:06:49 ze_monkey-imac kernel[0]: [ffffff800c277600][AppleMultitouchHIDEventDriver::start] entered
Mar 1 11:06:49 ze_monkey-imac kernel[0]: MacAuthEvent en1   Auth result for: 00:e1:25:87:de:37 MAC AUTH succeeded
Mar 1 11:06:49 ze_monkey-imac kernel[0]: wlEvent: en1 en1 Link UP virtIf = 0
Mar 1 11:06:49 ze_monkey-imac kernel[0]: AirPort: Link Up on en1
Mar 1 11:06:49 ze_monkey-imac kernel[0]: en1: BSSID changed to 00:e1:25:87:de:37
Mar 1 11:06:50 ze_monkey-imac kernel[0]: AirPort: RSN handshake complete on en1
Mar 1 11:06:50 ze_monkey-imac kernel[0]: [ffffff800c1e1c00][AppleMultitouchDevice::start] entered
Mar 1 11:06:57 ze_monkey-imac kernel[0]: macx_swapon SUCCESS
Do you know anywhere else I can look for errors to help understand the problem further?
Any suggestions on what to do next?

I have a grey screen when booting up my MacBook with stop sign, don't know what to do?

My MacBook Pro will not start up, it has a grey screen and a stop sign. I have looked at other advice and I don't have a snow leopard disk to put in. What shall I do? I have a lot of work on it which I think I have backed it up with iCloud but would like to get my mac functioning again.

You can buy Snow Leopard from Apple for $20.
http://store.apple.com/us/product/MC573/mac-os-x-106-snow-leopard
It's a long shot, but worth testing if the computer will boot in Target Disk Mode. Restart the computer and immediately hold down the T key. If the computer boots with a firewire icon on the screen it can be connected to another Mac in TDM.
http://support.apple.com/kb/ht1661
Post back if the fw icon shows up on the screen and you need more instructions. You will need another Mac to be the host for TDM.

Help? iMac has no access to files. Only grey Screen. Boots up to Browser.

I need help! My iMac either has been attacked by Virus or Worm. I can boot up to a Firefox Browser but that is all. The iMac has no files accessable and the Desktop is just a grey screen. I tried inserting the Mountain Lion Disk but could not access it, and it can not be ejected. No external Disk is accessable.
I don't know what to do?

If you're running Mountain Lion (there isn't normally a separate install/restore disk unless you specifically made one from the downloaded installer file, so not sure what disk you put in the drive) try booting into the Recovery HD, select Disk Utility, click on Macintosh HD and select 'repair disk'. If any changes are made click on repair disk again until you get a clear pass. Restart as normal from the Apple menu.
Restart holding Command=r to boot in the Recovery. More info here:
http://support.apple.com/kb/HT4718
To eject the disk try restarting holding down the mouse button until the disk is ejected. Other possibilities for ejecting a stuck disk here (although you obviously need a working machine to be able to try them):
http://osxdaily.com/2009/08/28/eject-a-stuck-disk-from-your-mac-dvd-super-drive/

Getting grey screen on booting MacPro 1,1; only able to use Safe Boot

I have a Mac Pro 1,1 Desktop running Lion.
Processor 2 x 2.66 GHz Dual-Core Intel Xeon
Memory 2 GB 667 MHz DDR2 FB-DIMM
Graphics NVIDIA GeForce 7300 GT 256 MB
Software Mac OS X Lion 10.7.5 (11G63)
The issue I'm having is the computer started booting to a grey screen with the spinning wheel and would get stuck there. The only way I was able to boot was Safe Boot. From there I could access files on the hard drive and ran a time machine backup.
After doing some research, I read this could be hard drive failure so I bought a new 3 TB SATA WD hard drive, installed it, formatted with disk utilitiy and installed OS X Lion on the new drive. It booted up fine after the install.
On the next reboot, same grey screen. Now I'm back to only being able to use Safe Boot mode to access the computer.
I have now shut down the computer and removed the old hard drive.
I've tried resetting PRAM and no luck.
I tried to run the apple hardware test but couldn't get it to run no matter what I tried.
Any advice? I'm at a loss. I really love this Mac and don't want to replace it just yet.

I'm finding these entries in system.log.
I'm particularly puzzled by " Load com.apple.driver.AppleSMBusPCI failed.." and similar messages.
O3REQUIRE FAILED: ret == 0
Nov 4 17:27:32 Mac-Pro loginwindow[43]: Failed to lookup Bezel UI Server port: Bootstrap Unknown Service.
Nov 4 17:29:18 localhost com.apple.launchd[1] (org.cups.cupsd): Path monitoring failed on "/private/var/spool/cups/cache/org.cups.cupsd": No such file or directory
Nov 4 17:29:23 localhost UserEventAgent[11]: CaptiveNetworkSupport:CaptiveSCRebuildCache:81 Failed to get service order
Nov 4 17:29:23 localhost UserEventAgent[11]: CaptiveNetworkSupport:CaptiveSCRebuildCache:81 Failed to get service order
O3REQUIRE FAILED: ret == 0
Nov 4 17:29:27 Mac-Pro loginwindow[46]: Failed to lookup Bezel UI Server port: Bootstrap Unknown Service.
Nov 4 17:38:36 localhost com.apple.launchd[1] (org.cups.cupsd): Path monitoring failed on "/private/var/spool/cups/cache/org.cups.cupsd": No such file or directory
Nov 4 17:38:37 localhost UserEventAgent[11]: CaptiveNetworkSupport:CaptiveSCRebuildCache:81 Failed to get service order
Nov 4 17:38:37 localhost UserEventAgent[11]: CaptiveNetworkSupport:CaptiveSCRebuildCache:81 Failed to get service order
Nov 4 17:38:39 localhost UserEventAgent[11]: CaptiveNetworkSupport:CaptiveSCRebuildCache:81 Failed to get service order
Nov 4 17:38:42 Mac-Pro ntpd[38]: bind(25) AF_INET6 fe80::217:f2ff:fe06:b294%4#123 flags 0x11 failed: Can't assign requested address
Nov 4 17:43:03 localhost com.apple.launchd[1] (org.cups.cupsd): Path monitoring failed on "/private/var/spool/cups/cache/org.cups.cupsd": No such file or directory
Nov 4 17:43:10 localhost UserEventAgent[10]: CaptiveNetworkSupport:CaptiveSCRebuildCache:81 Failed to get service order
Nov 4 17:43:10 localhost UserEventAgent[10]: CaptiveNetworkSupport:CaptiveSCRebuildCache:81 Failed to get service order
Nov 4 17:43:15 localhost UserEventAgent[10]: CaptiveNetworkSupport:CaptiveSCRebuildCache:81 Failed to get service order
Nov 4 17:43:15 localhost configd[14]: bootp_session_transmit: bpf_write(en2) failed: Network is down (50)
Nov 4 17:43:15 localhost configd[14]: DHCP en2: INIT transmit failed
Nov 4 17:43:21 Mac-Pro com.apple.kextd[9]: Load com.apple.driver.AppleSMBusPCI failed; removing personalities from kernel.
Nov 4 17:43:21 Mac-Pro com.apple.kextd[9]: Load com.apple.driver.AppleHDAController failed; removing personalities from kernel.
Nov 4 17:43:21Mac-Pro com.apple.kextd[9]: Load com.apple.driver.AppleMCEDriver failed; removing personalities from kernel.
Nov 4 17:43:21Mac-Pro com.apple.kextd[9]: Load com.apple.iokit.IOFireWireIP failed; removing personalities from kernel.
Nov 4 17:43:21 Mac-Pro com.apple.kextd[9]: Load com.apple.driver.AppleUSBDisplays failed; removing personalities from kernel.
Nov 4 17:43:22 Mac-Pro com.apple.kextd[9]: Load com.apple.driver.AudioIPCDriver failed; removing personalities from kernel.
Nov 4 17:43:22 Mac-Pro com.apple.kextd[9]: Load com.apple.driver.AudioIPCDriver failed; removing personalities from kernel.
Nov 4 17:43:22 Mac-Pro com.apple.kextd[9]: Load com.apple.driver.AppleTyMCEDriver failed; removing personalities from kernel.
Nov 4 17:43:22 Mac-Pro com.apple.kextd[9]: Load com.apple.iokit.IOBluetoothSerialManager failed; removing personalities from kernel.
Nov 4 17:43:22 Mac-Pro com.apple.kextd[9]: Load com.apple.iokit.IOSurface failed; removing personalities from kernel.
Nov 4 17:43:22 Mac-Pro com.apple.kextd[9]: Load com.apple.GeForce7xxx failed; removing personalities from kernel.
Nov 4 17:43:22 Mac-Pro com.apple.kextd[9]: Load com.apple.iokit.IOUserEthernet failed; removing personalities from kernel.
Nov 4 17:43:22 Mac-Pro com.apple.kextd[9]: Load com.apple.GeForce failed; removing personalities from kernel.
Nov 4 17:43:22 Mac-Pro com.apple.kextd[9]: Load com.apple.driver.AppleMCCSControl failed; removing personalities from kernel.
Nov 4 17:43:22 Mac-Pro com.apple.kextd[9]: Load com.apple.driver.AppleUpstreamUserClient failed; removing personalities from kernel.
Nov 4 18:17:43 Mac-Pro com.apple.kextd[9]: Load com.apple.driver.AppleMCEDriver failed; removing personalities from kernel.
Nov 4 18:17:43 Mac-Pro com.apple.kextd[9]: Load com.apple.driver.AppleSMBusPCI failed; removing personalities from kernel.
Nov 4 18:17:43 Mac-Pro com.apple.kextd[9]: Load com.apple.driver.AppleHDAController failed; removing personalities from kernel.
Nov 4 18:17:43 Mac-Pro com.apple.kextd[9]: Load com.apple.driver.AppleMCCSControl failed; removing personalities from kernel.
Nov 4 18:17:43 Mac-Pro com.apple.kextd[9]: Load com.apple.driver.AppleTyMCEDriver failed; removing personalities from kernel.
Nov 4 18:17:43 Mac-Pro com.apple.kextd[9]: Load com.apple.driver.AudioIPCDriver failed; removing personalities from kernel.
Nov 4 18:17:43 Mac-Pro com.apple.kextd[9]: Load com.apple.iokit.IOFireWireIP failed; removing personalities from kernel.
Nov 4 18:17:43 Mac-Pro com.apple.kextd[9]: Load com.apple.driver.AppleUpstreamUserClient failed; removing personalities from kernel.
Nov 4 18:17:43 Mac-Pro com.apple.kextd[9]: Load com.apple.iokit.IOBluetoothSerialManager failed; removing personalities from kernel.
Nov 4 18:17:44 Mac-Pro com.apple.kextd[9]: Load com.apple.iokit.IOSurface failed; removing personalities from kernel.
Nov 4 18:17:44 Mac-Pro com.apple.kextd[9]: Load com.apple.GeForce7xxx failed; removing personalities from kernel.
Nov 4 18:17:44 Mac-Pro com.apple.kextd[9]: Load com.apple.iokit.IOUserEthernet failed; removing personalities from kernel.
Nov 4 18:17:44 Mac-Pro com.apple.kextd[9]: Load com.apple.GeForce failed; removing personalities from kernel.
Nov 4 18:19:03 Mac-Pro talagent[134]: PersistentUI: CSBackupSetItemExcluded() failed with OSStatus -61
Nov 6 18:12:59 Mac-Pro ntpd[17]: bind(25) AF_INET6 fe80::217:f2ff:fe06:b294%4#123 flags 0x11 failed: Can't assign requested address
Nov 7 17:49:04 Mac-Pro ntpd[17]: bind(25) AF_INET6 fe80::217:f2ff:fe06:b294%4#123 flags 0x11 failed: Can't assign requested address
Nov 8 18:13:53 Mac-Pro ntpd[17]: bind(25) AF_INET6 fe80::217:f2ff:fe06:b294%4#123 flags 0x11 failed: Can't assign requested address

TS2570 My mac pro book 13 just shows grey screen and booting up but nothing else

My mac book pro 13 just as grey screen and trying to boot up any ideas thanks

I am having the same problem on my Mac Book Pro 13" Mic 2010. The sceen goes gray on reboot with the spinning wheel.

Blue or grey screen on boot

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