Mac stuck in safe mode start up loop

Hi everyone,
it seems I have run into a problem and can't find answers online.
First off I have a MacBook intel core duo on the latest snow leopard and mac software is up to date.
It all started when I had to restore my iPhone and it had some problems and got stuck in dfu mode, so when I decided to reboot it I unpluged it and went to reboot and problems started. Finder kept crashing. When I started up in safe mode I decided to save some important files and when I was done the finder problems persisted even while in safe mode. When I rebooted it would start up in safe mode and the loading bar on the bottom would get about a fifth of the way and stop, it would try again and get the as far as before and then shut down.
I tried taking out and putting back in the HD and ram as well as verbose mode. It says
Disk0s2: I/o error
invalid node structure
(8, 12827)
**the volume mac HD could not be verified completely.
/dev/rdisk0s2 (hfs) exited with signal 8
When I decided all was hopeless I tried reinstalling the os but it got stuck on examining additional disks.
If you need any info let me know. HUGE thanks ahead of time as I am writing this from my iPhone 2g and have a useless MacBook and dfu'd iPhone 4.

Restart from your installer disc. Do not run the installer. Instead, from the Utilities menu select Disk Utility & run its Repair Disk step. If it can repair the HD, try reinstalling the OS again. If it cannot, you can try a more powerful (& expensive) disk repair utility like Disk Warrior, which may or may not be able to repair the damage. Otherwise, you will need to reformat the HD (losing all its data) to recover.
You should always have a backup of your data. If you do not, it may be worth gambling on the price of Disk Warrior, but remember that there are no guarantees it can repair the damage.

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Message was edited by: Kittikatt
Message was edited by: Kittikatt

Here's what worked: http://support.microsoft.com/kb/330184
I followed the instructions above and once I finished, After re-booting, I selected Microsoft Windows XP Professional and the System Configuration Utility came up.
On the “General” tab, it shows that the Start Up Selection is on “Selective Startup” with everything checked, but what’s marked “Using Modified BOOT.INI
Tried to change it to “Normal Startup – load all device drivers and services” then re-start.
Windows came back up, but so did the System Configuration Utility and still showing that it was starting up with “Selective Startup”
Now just need to figure out how to start it up in “Normal”, if in fact that’s possible. Will keep you posted and if anyone has any further suggestions, that would be much appreciated.
I do hope this will help all the others that have run into the main issue, which I have found is caused by the Parallels Desktop by they way, not Microsoft, and that start having issues by getting the dreaded " hal.dll " file is missing or corrupt on a direct Boot to Windows.
Very long and sleepless night….
Kitti

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Hello @LogicMantra,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
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I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
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Hi
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Hope this helps. Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

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Hi,
Today I managed to communicate with MyRIO and now its working again.
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How to start my mac book pro safe mode?

my mac book pro is not start up but showing white screen . what should i do ?

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
Step 1
The first step in dealing with a startup failure is to secure the data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since the last backup, you can skip this step.
There are several ways to back up a Mac that is unable to start. You need an external hard drive to hold the backup data.
a. Start up from the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.” The article refers to starting up from a DVD, but the procedure in Recovery mode is the same. You don't need a DVD if you're running OS X 10.7 or later.
b. If Step 1a fails because of disk errors, and no other Mac is available, then you may be able to salvage some of your files by copying them in the Finder. If you already have an external drive with OS X installed, start up from it. Otherwise, if you have Internet access, follow the instructions on this page to prepare the external drive and install OS X on it. You'll use the Recovery installer, rather than downloading it from the App Store.
c. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, start the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
d. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
If the startup process stops at a blank gray screen with no Apple logo or spinning "daisy wheel," then the startup volume may be full. If you had previously seen warnings of low disk space, this is almost certainly the case. You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else use the technique in Step 1b, 1c, or 1d to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.
Step 3
Sometimes a startup failure can be resolved by resetting the NVRAM.
Step 4
If you use a wireless keyboard, trackpad, or mouse, replace or recharge the batteries. The battery level shown in the Bluetooth menu item may not be accurate.
Step 5
If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
Step 6
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to start up, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can start up now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
Step 7
If you've started from an external storage device, make sure that the internal startup volume is selected in the Startup Disk pane of System Preferences.
Start up in safe mode. Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to start and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know the login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you start up in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, the startup volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 11. If you ever have another problem with the drive, replace it immediately.
If you can start and log in in safe mode, empty the Trash, and then open the Finder Info window on the startup volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then restart as usual (i.e., not in safe mode.)
If the startup process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 8
Launch Disk Utility in Recovery mode (see Step 1.) Select the startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then restart as usual.
Step 9
If the startup device is an aftermarket SSD, it may need a firmware update and/or a forced "garbage collection." Instructions for doing this with a Crucial-branded SSD were posted here. Some of those instructions may apply to other brands of SSD, but you should check with the vendor's tech support.
Step 10
Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 11
Do as in Step 9, but this time erase the startup volume in Disk Utility before installing. The system should automatically restart into the Setup Assistant. Follow the prompts to transfer the data from a Time Machine or other backup.
Step 12
This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a startup failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
Step 13
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

OS X Mavericks installations fails after reboot, stuck. Safe mode does not help

Quick Summary: Installation of Mavericks gets stuck after reboot, no safe mode boot, only recovery console works.
Update: Currently following procedure http://support.apple.com/kb/TS2570?viewlocale=en_US
I have upgrade 4 out of my 5 machines, but the most important iMac 27" mid 2010 went through with the installation and then got stuck on a grey screen with the apple logo and a spinning wheel for 6 hours.
A few restarts did not help.
Started from recovery a new download and install. But it ended up in the same end.
Trying safe mode/boot, but does not finish
Going back to recovery and try repair disk, does not help
Going to recovery using terminal resetpassword and then setting the permissions for all login accounts back, no good.
Going to recovery and using terminal to check /var/log of the mounted Macintosh HD.log shows at the end "The installation was successfull"
System.log shows
com.apple.kextd: Failed to send personalities to the kernel.
Error: Couldn't send kext personalities to the IOCatalogue.
Exited with code: 71
Throttling respawn: Will start in 8 seconds.
Resetting NVRAM/PRAM and reboot, waiting so far stuck but I still hear some disk activity, waiting a little bit longer.
Any help?

Do you have a Recovery HD from your previous systems?
Boot Using OPTION key:
1. Restart the computer.
2. Immediately after the chime press and hold down the
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3. Release the key when the boot manager appears.
4. Select the desired disk icon from which you want to boot.
5. Click on the arrow button below the icon.
Look for another Recovery HD, although you need the OS 10.9 one if it's available. If it's not, then you will need to start over from scratch by erasing the drive then reinstalling 10.9.
Install or Reinstall Mavericks, Lion/Mountain Lion from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
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.
Erase the hard drive:
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3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
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Reinstall Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
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Surface Pro 1 will not refresh and is stuck in safe mode

Surface Pro 1, Win 8.1, would not allow refresh, or reset. Did allow entry into Safe Mode one time. Now it is stuck there. Cannot do anything else.
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TIA!!

Hi,
Did you still remember what the messages it showed out as it wouldn't allow to do a reset/refresh?
Could we enter the safe mode?
If surface is not responding, take a try with the steps mentioned in the below article:
Surface Pro: Windows won't start or stops responding
For Restore, refresh or reset Surface Pro, see:
Restore, refresh or reset Surface Pro
More information regarding surface recovery, please check:
Warranty, Service and Recovery
For better support, we could try to ask in the following forum:
http://answers.microsoft.com/en-us/surface/forum?auth=1
Thank you for your understanding
Best regards
Michael Shao
TechNet Community Support

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