Quick blue screen between start up sound and log-in

Hey all,
Does anyone get what the title says when they start up their computer running Mountain Lion? I recently had my Retina display replaced since it was faulty (went from an LG to a Samsung) and I just noticed that when I restart or boot up from a shut down I get this. This seems to be the only video anomally I can find, and it is more of an annoyance than anything, but just wondering if anyone else has had it and has fixed it. For reference, I have already cleared/reset the smc and NVram. The hard drive has just been checked and repaired, and the next step if no-one has any ideas is just to do a quick re-install of OSX next week. Thanks for the help.

I noticed it just once. Blue screen was there for a second,very fleeting.
I searched and I found these articles.
Explanation: Launch of LaunchD process.
http://support.apple.com/kb/HT2674
http://www.tuaw.com/2010/10/22/mac-101-whats-happening-when-your-mac-is-starting -up/
Best.

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I get a blue screen; tried the single boot and get "audit space low"; how to I get the computer to start again?

I get a blue screen; tried the single boot and get "audit space low"; how to I get the computer to start again?

In the text you say you are using Snow Leopard. Snow Leopard will not operate on a G4 (or any Mac with a PowerPC processor). Leopard OS 10.5 is the max OS for PowerPC processor Macs. Your profile shows OS 10.5.6. What OS are you using (or trying to use)?
Will the PB boot using a systen install DVD?
 Cheers, Tom

Why can't I access my own wifi? why do I get a blue screen on start up or after watching a netflix movie, and why is it getting so hot?

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I was re-decorating my blogger .. then I got the 'Bad Request Error 400' .. I re-formatted my computer, reloaded all .. I can now access my Blogger sites .. Don't know what the problem is/was, but I solved it by reloading my computer to Out-of-Box condition, and all is perfect now .. I have an alert set up for this Error 400 .. Masses of people are having problems daily ..
http://littlemisscinderellasquotes.blogspot.com/

I have an iMac from 2008. When I start I get gray screen with apple and turning gear. Next blue screen. Then light blue screen with turning gear. Back to blue screen. Now just back and forth blue to light blur

I have an iMac from 2008. When I start I get gray screen with apple and turning gear. Next blue screen. Then light blue screen with turning gear. Back to blue screen. Now just back and forth blue to light blur

Reinstall OS X:
Reinstall OS X without erasing the drive
Do the following:
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 the Combo Updater for the version you prefer from support.apple.com/downloads/.
Reinstalling 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: Select Reinstall Lion and click on the Continue button.
Note: You can also re-download the Lion installer by opening the App Store application. Hold down the OPTION key and click on the Purchases icon in the toolbar. You should now see an active Install button to the right of your Lion purchase entry. There are situations in which this will not work. For example, if you are already booted into the Lion you originally purchased with your Apple ID or if an instance of the Lion installer is located anywhere on your computer.

Blue screen on start up. The wheel spin and the blue screen gets brighter for a second, then the blue screen dims and it repeats with the wheel.

When I start up my imac, I get a blue screen. The wheel spin and the screen gets brighter for a second, then the blue screen dims and it repeats with the wheel.

Are you referring to the startup screen which is normally gray with the dark gray Apple logo or are you referring the login screen which is typically blue? If it's the latter you might give this a try:
Clearing Caches to Fix Login Problem
You will need to type some Unix commands. If you are not comfortable with this, I don't know of anything other than a re-install. But if you are careful, you should be OK. I recommend you print this out in a largish mono-spaced font so you don't miss any spaces (or add extra ones). Note that case is important.
Be careful. Some of these commands are dangerous, since you are going to be root.
Start up in Single-user Mode. When this has finished you will see a prompt ending in '#', although there may be other messages. Enter the following commands after the prompt:
/sbin/fsck -fy
Press RETURN. Wait a few seconds for 8-10 lines of output. If the last line says repairs were carried out, repeat this command until you get a message 'The volume <yourdiskname> appears to be OK'. Then continue with:
/sbin/mount -uw /
cd /Library/Preferences
rm com.apple.loginwindow.plist
rm com.apple.windowserver.plist
cd /Library/Caches
rm -r *
cd /System/Library
cd /System/Library/Caches
rm -r *
reboot
Press RETURN after each command.
This should now take you to a proper login screen after the normal boot sequence. You should then Repair Permissions by using Disk Utility (in your /Applications/Utilities folder).
If it's the former then reinstall OS X. For Snow Leopard:
Reinstall OS X without erasing the drive
Do the following:
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 the Combo Updater for the version you prefer from support.apple.com/downloads/.

Blue screen on start up, even in safe mode, common fixes not working

I did quite a bit of searching for the problem I'm having, and it seems some of the symptoms are common, but none of the various fixes I've come across have worked. Any help pointing to other things to try would be appreciated, as it is getting harder to search for things without finding repeats of what I've already tried. Also, I was going to post this on the OSX 10.4 board, but changes in symptoms (mentioned at the end of this post) are starting to make me think this could be a hardware issue.
The main problem is that my computer boots normally until the blue screen just before the login window should appear, then hangs.
My system: iBook G4, 800 MHz, running 10.4.11, has an extra GB of RAM installed (for a total of 1.1 GB), new hard drive that is less than a year old.
Things I've tried:
Booting in safe mode: No change, still hangs at blue screen.
Removing airport card, and extra ram has no effect.
I've done a PRAM reset
I've done a PSU reset
Checked for file system and permissions errors with Disk Utility on OS CD
Booting into single user mode works fine, where I tried:
fsck -fy, no errors reported
running /etc/rc worked fine for a while
No unexpected errors or problems seen in /Library/Logs/Console/501/console.log, or in /var/log/system.log
I've temporarily moved /Library/Preferences, /Library/Caches, and /System/Library/Caches, /User/Library/Caches, /User/Library/Preferences, /System/Extensions.kextcache and /var/db/netinfo/local.nidb to make sure none of those were corrupted (plus checked preferences with plutil), nothing fixed.
I've double checked the permissions of the root directory.
This problem did not follow an update or installation of any kind. The computer just completely locked up in the middle of using Safari (and just typing in an edit box, nothing with much of a workload) and the blue screen hang happened upon rebooting after shutting down by holding down the power button.
Single user mode appeared to work fine, although I did get single user mode to hang when trying to back up a few GB of files onto a thumbdrive after copying about 90% of the files. And then a new problem came up where afterward, now the blue screen pops up and hangs about 30 seconds after running /etc/rc returns to the prompt (and about 20 seconds after last of it finishes outputting). I've tried clearing caches again but /etc/rc still causes this.
I was going to try to run AppleJack (recommended for checking permissions and clearing caches) after copying the files to the thumbdrive, but of course didn't think to install that until after I had a problem. And now that /etc/rc causes a problem, I don't know how to attach the AppleJack .dmg file other than hdiutil, which needs the /etc/rc to have been run, and also can't remount the thumbdrive to copy any more files over.
After this recent problem, I noticed that now booting from the OS CD goes to the blue screen too and no further. Has anyone else seen such a problem? I've heard of some issues with loose GPUs in the iBook G4, but they seem to mention scrambled or no/black video (video looks fine in single user mode and in open firmware, and up to the blue screen which is clear and bright). So now I don't seem to have an option to try an Archive & Install of the OS (which I was hoping to avoid, due to effort needed to reinstall other software).

Thank you, I had forgotten about target mode. I was able to back up all of my files. I also copied some additional 50 GB of files of the disk as a stress test and the hard drive worked fine and quick (and because it was quicker than retrieving the same files from a network drive to my desktop).
I was hoping to also unpack the Applejack files on my desktop and put them back so I could run them in single user mode without running /etc/rc. However I haven't been able to get my Linux desktop to mount the iBook in Read-Write instead of Read-Only yet (I don't have access to another Mac at the moment).

Blue screen after start up; mouse still moves but no icons are visible

blue screen after start up; mouse still moves but no icons are visible. Removed SDRAM and reinserted the SDRAM

Thank you, I had forgotten about target mode. I was able to back up all of my files. I also copied some additional 50 GB of files of the disk as a stress test and the hard drive worked fine and quick (and because it was quicker than retrieving the same files from a network drive to my desktop).
I was hoping to also unpack the Applejack files on my desktop and put them back so I could run them in single user mode without running /etc/rc. However I haven't been able to get my Linux desktop to mount the iBook in Read-Write instead of Read-Only yet (I don't have access to another Mac at the moment).

Blue Screen on start up with dual monitors

I have a macpro running Mac OS X 10.5.6 (9G55) when 2 monitors are hooked up to it the computer the machine Blue Screens on start up. This also occurs when the computer wakes up from a deep sleep. Currently the only work around is to just use one monitor. Ive read the posting here and on macosrumors.com, but there does not seem to be a solution, however most post are from last summer. Was this fixed at some point? Is there a solution? I also tried boot from another drive (from another macpro) with both monitors hooked up and the problem continues.
Ive also read the KB article and removed ApplicationEnchancer.bundle, but the problem continues.
http://support.apple.com/kb/TS1545?viewlocale=en_US
Any help would be much appreciated.
Thanks,
Scott

Scott,
Ok here are the next things on my list, and I will start with what I think is the most valuable to the just plain fun and simple you and I would be shocked if it fixed it. I only skimmed your other post, if you feel that something I recommend is a repeat you can ignore it and I will not take any offense. Sorry If my post is a little loopy I've been up for way to long.
1) Safe Boot your mac. To do so hold shift whilst your Mac boots. Please note it will take longer to load.
Starting up into Safe Mode does several things:
1. It forces a directory check of the startup volume.
2. It loads only required kernel extensions (some of the items in /System/Library/Extensions).
3. In Mac OS X 10.3.9 or earlier, Safe Mode runs only Apple-installed startup items (such items may be installed either in /Library/StartupItems or in /System/Library/StartupItems; these are different than user-selected account login items).
4. It disables all fonts other than those in /System/Library/Fonts (Mac OS X 10.4 or later).
5. It moves to the Trash all font caches normally stored in /Library/Caches/com.apple.ATS/(uid)/ , where (uid) is a user ID number such as 501 (Mac OS X 10.4 or later).
6. It disables all startup items and login items (Mac OS X 10.4 or later).
7. Mac OS X 10.5.6 or later: A Safe Boot deletes the dynamic loader shared cache at (/var/db/dyld/). A cache with issues may cause a blue screen on startup, particularly after a Software Update. Restarting normally recreates this cache.
http://support.apple.com/kb/HT1564
2) Try reseting the Pram.
Resetting PRAM and NVRAM
1. Shut down the computer.
2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3. Turn on the computer.
4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6. Release the keys.
http://support.apple.com/kb/HT1379
3) Reset the startup Disk. Open System Preferences -> Startup Disk -> Select Mac OS X.
I'll leave you with that, please come back with your results.
Weston

Blue screen on start up. Safe mode not working?

Blue screen on start up. Safe mode not working, any suggestions?

Thank you, I had forgotten about target mode. I was able to back up all of my files. I also copied some additional 50 GB of files of the disk as a stress test and the hard drive worked fine and quick (and because it was quicker than retrieving the same files from a network drive to my desktop).
I was hoping to also unpack the Applejack files on my desktop and put them back so I could run them in single user mode without running /etc/rc. However I haven't been able to get my Linux desktop to mount the iBook in Read-Write instead of Read-Only yet (I don't have access to another Mac at the moment).

Blue screen at start up Safe Boot however works...please help

After reading various posts around I can't nail it down...
My powerbook boots to a blue screen which changes 2 hues and then stops.
However, it will boot up in safe boot.
Things I have tried so far (hope I don't forget something):
1) Repair permissions.
2) Boot from Diskwarrior cd and perform repairs.
3) Reset nvram
4) Boot in open-firmware mode and reset pram and all
5) boot in single-user mode and perform that unix command ("fsck -fy" or something like that
6) ran apple hardware diagnostics from original apple cd that came with my powerbook. Here is where it gets interesting. The first time it reported an error with one of my RAM chips. I ran it again and it passed all tests. I ran it a third time and passed again...."hm..." I murmured to myself.
At this point I am suspecting it is a hardware problem but I can't trace it.
Keep in mind that the powerbook boots up fine Safe Boot mode.
Please help!

Unfortunately this problem remains unsolved.
I am able to work in safe mode however, no sound, no extensions, nada...
Too bad as I was eagerly waiting for the Airbook to be my pb replacement which isn't the case.
I a disappointed that Apple gave precedence to form over function for the Air. It will never replace
the tiny footprint of my pb, nor does it offer its options.
I don't care if a laptop is a millimeter thin. It still has the same footprint as a Macbook on a desk.
Apple tell us if this is easily fixable or should be just trash our PBs?
Other users report the same problem on various sites...

Can't get past the blue screen with "starting Mac OS X"

I am having problems with starting my iMac. It gets to the blue screen with "starting Mac OS X" but won't go beyond that point. I was able to get the disc drive open with the help of other posts, holding down the mouse while turning on the computer, but the drive won't stay closed with the install disc in it. I have even tried holding down the "c" key while restarting the computer and it wouldn't work. Any help would be greatly appreciated. So much info that I could really use. Also, please keep in mind that I am not too computer savy. Simple language please.
Thanks

If the steps I provided in my earlier post are not helping, then I see your options at this point as follows:
1. Run the Apple Hardware Test (AHT) that came the affected computer. See my "Apple Hardware Test" FAQ for comprehensive advice on using the AHT in troubleshooting.
2. Performing an Archive and Install. For important tips on this, see my "General advice on performing an Archive and Install" FAQ. Perform the steps therein in the specified order.
3. Take the computer in for service. If there is an Apple Retail Store in your area, I'd recommend taking it there. You may wish to call ahead to make an appointment at the Genius Bar.
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

Blue screen at start up,safe mode only, resolved ,what next?

I got the old stuck on blue screen at start up ,
would only boot in safe mode , after two afternoons of RAM test , repairing disk permissions , hrdware tests , zapping PRam and the likes to no avail , I finally resolved the problem thanks to a tip from this forum:
bad video card drivers ( ATIRadeon 8500 ) , after removing them from the extension folder , it boots up! ( I tried to reset the pram , it won't work though , one chime only then nothing).
so I'm wondering what's next , can i reinstall the video card drivers only ?
is it the card itself ? (everything looks normal) or should I go for an archive and install ?
any input would be great,
Thanks,
JB

Hi-
Jean Baptiste mentioned that he removed extensions for the drivers.
Removing a conflicting driver is fine as long as the driver specific for the card installed remains.
In this case, I think it may have been a corrupt driver, rather than a conflicting driver.
Radeon drivers in OS X have a good track record of compatibility, and such driver conflict is not a historically common occurrence.
Hard drive maintenance with Disk Warrior is the best way to correct corrupt files, unless bad RAM is corrupting the files.....
In your case, it shouldn't hurt anything to remove the Radeon 8500 drivers.
Could it be the driver extensions that are preventing a proper boot. The monitor displays perfectly in safe mode so I don't understand why it would be the video card.
Booting to Safe mode unloads drivers. Only very basic core graphics rendering drivers are loaded.
No Quartz/Quartz Extreme, no Core Image, no 3D acceleration, etc.
This doesn't tax a graphics card.
Failure to boot, or failure of graphics when drivers are loaded are due to one of two things- corrupt drivers or failing components on the graphics card.
A reinstall of the OS can rule out the first.
Installing a different graphics card is the only way to rule out the second.
Before buying a new card, I would try a fresh OS.
Installing a new OS on a separate drive, and booting to that is an easy way to test.

How to get past blue screen at start up on MacPro?

I have a blue screen at start up and the MacPro won't boot up.
Before I attempt to hold down keys at start, pls let me know which one to hold down.

See if there is assistance here:
https://discussions.apple.com/docs/DOC-5282
Ciao.

Blue Screen at Start up after changed HD Preferences-Need to back up files!

So here’s what happened,
A few days ago I mistakenly took my HD Drive and changed the permissions on it. Since then, when I start up I first see the apple logo (with chime) followed by a blue screen with a flashing wheel (loading). I have called tech support over the phone and I was told that I should use my mac OS X CD to erase and install to just wipe everything out. Which is fine with me, however, I do not have a back up and would like to be able to keep my files.
I was then told that I would be able to “migrate” my files to a working macbook, then to go ahead and erase the system and put them back in. The problem is that I tried doing the whole migration process but it didn’t work because I could not login to my mac to initiate the process. I also then tried to look at my files from the network, but that is also blocked and does not show up on the other macbook’s available networks.
My question is, what can I do to extract my files from my macbook so I can add them in after I’ve reinstalled my system? Help!

"A1. If the disk in question is your Mac OS X startup disk and your computer stops starting up at the blue screen, restart with the Command and S keys held down, and enter the following commands:
mount -uw /
chown root /
chmod 1775 /
exit
I tried putting in the commands but was not able to exit properly.
After the chmod 1775 /
it asked if I wanted to see a list...
Did nothing for me. Any other suggestions?

Hi, Hi, Hi I have the old MacBook Pro. Upgraded to Mountain Lion which completely wrecked the system. So downgraded to Snow Leopard. The updated the combo update. Now stuck on blue screen at start-up. Need help. Greatly appreciated. Thank you.

Hi,
I have the old MacBook Pro. Upgraded to Mountain Lion which completely wrecked the system. So downgraded to Snow Leopard.
Then updated the combo update. Now stuck on blue screen at start-up.
Need help. Greatly appreciated. Thank you.

Downgrade Lion/Mountain Lion to Snow Leopard
1. 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.
2. After DU loads select your hard drive (this is the entry with the
      mfgr.'s ID and size) from the left side list. Note the SMART status
      of the drive in DU's status area. If it does not say "Verified" then
      the drive is failing or has failed and will need replacing. SMART
      info will not be reported on external drives. Otherwise, click on
      the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions
      from the drop down menu to one. Set the format type to Mac OS
      Extended (Journaled.) Click on the Options button, set the
      partition scheme to GUID then click on the OK button. Click on
      the Partition button and wait until the process has completed.
4. Quit DU and return to the installer. Install Snow Leopard.
This will erase the whole drive so be sure to backup your files if you don't have a backup already. If you have performed a TM backup using Lion be aware that you cannot restore from that backup in Snow Leopard (see below.) I suggest you make a separate backup using Carbon Copy Cloner.
If you have Snow Leopard Time Machine backups, do a full system restore per #14 in Time Machine - Frequently Asked Questions. If you have subsequent backups from Lion, you can restore newer items selectively, via the "Star Wars" display, per #15 there, but be careful; some Snow Leopard apps may not work with the Lion files.

Quick blue screen between start up sound and log-in

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