Leopard install failed: Incorrect # of Extended Attributes

Tried to install Leopard. Incorrect number of Extended Attributes. Could not be repaired using Disk Utility/First Aid. ERROR: Filesystem verify or repair failed. Please help avoid erase and install. Hard drive is Journaled HFS Plus Volume.

I have the same problem.
Anybody has an answer yet?

Similar Messages

Leopard Install fails with 2 minutes remaining

I have searched this forum and elsewhere on internet for similar issue. I hope someone here can help me. I am experienced Mac user but this is first time I have had problem I cannot solve by myself!
PowerMac G5 Dual 2.7 with 4.5GB RAM
I was running Tiger on the machine since purchase, no problems. I installed (Upgrade) Leopard (Family Pack)on the machine when it first came out,
no problems. Upgraded to 10.5.2 no problems. (Also installed Leopard on PowerBook G4, no problems.)
But earlier this week just surfing the web I get the gray overlay with "You must restart your computer" in 5 languages. Since then the machine gets the gray "Restart" overlay upon reboot.
I ran Apple Hardware Test (Extended) from the DVDs that came with the PowerMac. It took 2 hours but everything passed.
From this point I did the installs with only the keyboard and mouse plugged into the USB on the back of computer. No other connections except monitor.
I purchased new hard drive Erase w/ zeros and was able to reinstall Tiger successfully from the same original DVDs. Was able to upgrade that Tiger to 10.4.11. No problems. Multiple reboots, no gray overlay.
Now I try to upgrade to Leopard, and it got to "2 minutes remaining", and I get the gray overlay. So I try an Erase / install of Leopard to the new drive again, same gray overlay at 2 minutes remaining.
- Took the PRAM battery to Radio Shack and it measured around 3.4 volts (it is a 3.6 volt battery). I purchased a new battery anyway
and replaced it, tried Leopard install again, same gray overlay at 2 minutes remaining.
- Last, I took out 2GB of the non-Apple RAM, try install again, same gray overlay at 2 minutes remaining.
At this point I don't know what else to try. Maybe take out remaining 2GB of non-Apple RAM? That will leave .5GB RAM
Thank you for your help
Jenny Zhao

Thank you for the responses. I removed the other non-Apple RAM and attempted Leopard Install onto empty HD. The install process was much slower, and got the gray "Restart" overlay with 52 minutes remaining.
- never tried an "Archive and Install". Either Upgrade, Erase & Install, or Install.
- Hard drive. I get the gray "restart" overlay with two different HD, the one that had been running Leopard since 10/26/2007. And on the new HD purchased to try to resolve the issue. BTW I could connect to the original HD in Firewire Target mode no problem to pull files off. So i thought maybe problem w/ original HD with booting. But since I have same issue (gray overlay either running or installing Leopard) trying clean install on a brand new HD, I do not think HD.
- Heat: that is good observation. But then I was able to reinstall original Tiger no problem. So perhaps something with cooling has become enough to affect Leopard operation but not Tiger? I do not see any indication of leaking fluid (this is liquid cooled Power Mac G5, not Intel). How to troubleshoot heat issue?
- defective DVD: maybe. But worked OK first time Leopard installed on both Powermac and Powerbook.
I think maybe: some hardware besides RAM/Logic board/PRAM has failed or "become less than optimal" that Leopard is more sensitive to compared to Tiger. But how to diagnose?
AppleCare expires May 19 on this machine, perhaps I can contact Apple?
Jenny Zhao

Family Pack Leopard install fails G4 Dual 1.2Ghz

All, I purchased the Leopard family pack and have successfully installed it on an Intel Macbook Pro and a G5 2.3Ghz DP machine - flawless, no problems during installation or after.
However, any attempt to install on a G4 Dual 1.2Ghz + 2Gb of RAM + just bought a Seagate 500Gb Barracuda internal drive (well within the designated technical requirements), I've tried the following.
1. Booting the G4 off the Leopard install DVD, I get the following error: Failed Install message = "The Installer could not validate the contents of the Essentials Package...".
I can never get beyond this point. After receiving this error, the internal disk isn't even recognized on the bus - I have to pull the disk out, put it in an external case to reformat it. I've even tried a low level format and also had Seagate replace the disk thinking it was defective.
2. I then thought it may be an issue with putting the Seagate disk in cable select mode versus master / slave configuration. The Seagate is the only hard drive in the machine. I have tried both cable select and master/slave configuration - both freeze after install, etc. without fail.
3. Tried installing Leopard on the G4 by connecting it to the G5 in target disk mode. It installed, but routinely just freezes (NEVER had this issue with Tiger on this machine).
I do see lots of people posting issues with the "The Installer could not validate the contents of the Essentials Package..." error.
For the record, after successful Leopard install using technique #1 and #3 - I am also unable to run the Migration assistant - it fails every time with a kernel panic. I'm not having any trouble with the Leopard install media on any of the other 2 machines, nor did I have issues running the migration assistant.
Any ideas are appreciated. thx,

themdg - you said you put back your 2-512 original RAM cards and tried to install Leopard and the install failed. But my original, factory-installed RAM was third-party RAM which prevented me from installing Leopard, giving the “essentials” error. Only when I purchased RAM from Apple, and used only that RAM to install, could I get it to work correctly.
Check your original RAM. If it is not the Apple brand, it may not work because of that, even if it was the factory-installed RAM.
After I installed Leopard with only the Apple RAM, I added back the third-party RAM and I’ve been running Leopard flawlessly since.
It seems the installation software, which meticulously checks the installer disk for flaws, should also check the RAM to see if the installation will be successful (i.e., check to see if it is going to produce the “essentials” error) and also check to see if you have enough valid RAM to install, before it begins installation, and to let the user know there will be a problem unless the RAM is changed to valid cards.
I “assumed” I had enough valid RAM when I first tried to install Leopard because I had a G5, but it had only 256 MB of non-Apple brand RAM (minimum of 512 is required). A direct check of that by the installer and letting me know it was a problem would have saved me a lot of trouble checking lots of other potential problems, like a bad installer disk, a third-party drive, etc., before I figured out it was insufficient and incompatible RAM for the installation.
I read the minimal requirements for installation of Leopard and probably someone will say I should have checked all those before I tried the installation, but I didn’t, as I’m sure many others have not, because we “assume” Apple had tested it and would prevent us from making any mistake like this.
Previously Apple made their software and hardware to “just work” by providing error messages before we made an error and we have come to rely on that. But they overlooked this problem on this update. It’s the first time I’ve had a problem with an update from Apple.
I’m still a loyal Apple user, but I’ll check requirements a little closer with future updates.

Installing Mountain Lion from Snow Leopard, Install failed and HD write-locked

I recently downloaded the mountain lion installer from the App Store and I ran the installer. Stupid person as I am, I did not have any backups for my file and I naively assumed that an apple OS installer would be without flaws. Boy, was I wrong. I need every bytes of my data (or close to every bytes) but the installer failed.
Mid installation, the installer stopped and said that the installation failed and that I need to repair my disk. So I restarted the computer and I ran disk utilities (my start up disk was the OS installer and the installer allows me to run several programs, including terminal, disk utilities, and by the way, when I held option while starting up to see which start up disks I have, I only had the OS installer as the start up disk. Also, the installer allows me to run a program called "Startup Disk" when I click on the apple logo on the top left corner, but it doesn't allow me to startup my computer using Macintosh HD) and noticed that when I highlighted Macintosh HD, my "Repair Disk" button was grayed out. So first things first, I ran the "Verify Disk" button but after a minute or so, Disk Utilities said that verification failed and that Macintosh HD needs to be repaired. But the "repair disk" button is grayed out! So I went to the Mountain Lion installer again and ran it. Of course, it failed again so I restarted the computer.
So I tried to first back up all files in Macintosh HD to an external hard drive using Disk Utilities, and I used features such as "New Image" and "Restore" but they both ended up in "Input/Output error". I tried many methods with Disk Utilities but they resulted in errors.
After some research, I noticed that some people's computers worked after they reset their PRAM. So that's what I did. I held command+option+P+R when computer started up and I reset the PRAM. When the start up disk (which is the OS installer, not the normal operating system) loaded, I was greeted with choose languages option and then I was back in the Mountain Lion installer state. I again ran the installer again, hoping something would be different, but then it was different. But not in a good way. When I was told to choose where I would like to install Mountain Lion, I noticed that Macintosh HD was grayed out. Last time, I was at least able to run the installer but this time, Macintosh HD was grayed out. The installer said that my Macintosh HD was locked. After some research, I learned that apparently, the Mountain Lion installer write-locks Macintosh HD mid installation.
So now I am stuck and I am thinking of two things (plus some questions)
1. I am wondering if there is a way to unlock Macintosh HD. But even if I can unlock Macintosh HD, there is no guarantee that the installer will successfully install Mountain Lion, am I right?
a. so how can I un-write-lock Macintosh HD?
2. More realistically, I am thinking of borrowing someone else's macintosh computer and use it as the backup center. I have a firewire cable and a terrabyte external hard drive. So what I'm thinking is that I'll hook my computer in target mode to my friend's computer and I will also plug in my external hard drive to my friend's computer and then I can download and run Carbon Copy Cloner from my friend's computer to copy all data from my Macintosh HD to my external hard drive. And then I will erase my Macintosh HD, freshly install Mountain Lion onto it and then copy all data back from my external hard drive. But I am not sure about few things.
a. it looks like my Macintosh HD is write-locked. Can I still use Carbon Copy Cloner to copy all data from Macintosh HD (in target mode) to my external hard drive?
b. will my computer allow me to erase (or format) Macintosh HD?
c. will my erased/formatted Macintosh HD able to install + be installed Mountain Lion OS?
If you are here, then you have read my long long problem. Thank you very much and I would really really really appreciate your answers and opinions. Thanks

I'm not sure where you read that about the disk being "write-locked." That doesn't make much sense, given that the major task an installer like this must achieve is writing a whole bunch of files to the hard drive. I think your source was mistaken.
As to what happened, it sounds like your hard drive was badly corrupt to start with, or possibly was on the edge of failing and is now in the process of dying entirely. If you don't have backups of your data, that does not bode well for you, unfortunately. If you can manage to use target mode to copy your data, do that.
Once you're sure you've got all your data, you need to start up from your Snow Leopard install disk and repair the hard drive. (Since it sounds like the Mountain Lion installer didn't work, I wouldn't trust the recovery partition that Mountain Lion installs.) Or, even better, just erase the hard drive entirely and reinstall Snow Leopard. Then, once you're back up and running, with all your data back on the system and with Snow Leopard updated to the most recent version, try installing Mountain Lion again. If any of that fails again, the problem is likely to be a dying hard drive, and you'll need to replace it.

Mac OS X 10.5 Leopard Install Failed

Trying to upgrade a Power Mac Dual G5 from Mac OS X Tiger to Leopard 10.5. When I try to install the Leopard Disc, I keep getting an "Install Failed" message. This is what is said:
Install Failed
Mac OS X could not be installed on your computer
The source media you are installing from is damaged. Try installing from a different copy of the source media or contact the manufacturer for a replacement.
Click restart to restart your computer and try installing again.
Now, I've used this disc once before for an upgrade on a laptop and worked fine, just started to fail when used on the G5. The disc is not scratched, nor looks damaged. Not sure why it's saying damaged? Any insightful knowledge would be appreciated.
Thanks!

The install disks I have are the ones he got with his Mac Mini. Are there different install disks for iMacs? On the disks themselves, it says "for Mac computers."
Do I have to buy an OS which is specifically for iMac?
The discs that came with his computer have only the necessary software pieces needed to run his computer--it lacks the drivers that would be needed run your iMac. (In addition, installing the same copy of the OS on two computers would be a violation of the license, even if it worked.)
You need to buy a retail version of Leopard or Snow Leopard. Since your iMac has an intel processor, you can buy the cheaper Snow Leopard ($29) from the "Store" tab at the top of this page or anywhere that sells Mac software.

LEOPARD INSTALL FAILED - 2ND COPY OF LEOPARD!

I tried putting Leopard on - the disc was scanned and it then went on to install. About 1/3 way through, screen came up with "INSTALL FAILED... MAC OS X could not be installed on your computer. The source media you are installing from is damaged. Try installing from a different copy of the source media or contact the manufacturer for a replacement."
I went back to the Apple store in Regent Street, got a new copy, re-installed the computer with the original recovery discs, and then re-installed the Leopard disc. All was going well until again I got through the 1/3 part of install and the same thing happened as quoted above.
I can't believe the SECOND new copy I got can also be faulty... any other ideas? My machine is completely newly installed, and still no joy.
Does anyone know what else can be done?

OK great news. I finally got it to install on my G5.
See my previous post for the trial and errors.
Here is what I finally did:
1. Unplugged all external drives.
2. Removed all memory except what shipped with my G5. (don't skip this step because other's have said they found bad memory and that solved their problem too.)
3. Boot from the Leopard installer.
4. Ran disk utility before trying to install.
5. Repaired disk permisions from insaller disk.
6. Cant' recall if I rebooted again or not... sorry.
7. Installed Leopard flawlessly. (this was the first time it made it past about 75% before saying "Installation Failed" ... "this DVD disk is damaged etc."
8. I am back up and running.
Thanks for everyone's help.

Snow Leopard Install Failed

Tried installing Snow Leopard on MacBook Pro (Intel Core i5). Drive has been repartitioned, however install fails with message "Install Failed - Mac OS X could not be installed on your computer - The Installer could not copy the necessary support files".
Tried several times but same message each time. Can't even seem to eject disc to check it (although brand new so shouldn't be any problems). Help appreciated...

Restart, holding down the mouse key. That should eject the disc. You might have a faulty install disc. Call Apple.

Leopard install fails - No Previous systems - packages all over desktop

*My basic question is this*...+Can I hack into the "packages" and other weird files that the Leopard install has left all over my hard disk (in a mid-install failure) to try to retrieve, photos, stickies, and AppleMail?+
History: After an iTunes "update" I got a bluescreen on restart. After repeated restarts and ample time (hours) for a reboot, I thought it might be time for the Leopard upgrade. I booted off Leopard DVD and ran Disk First Aid first, then installed Leopard. The install failed midway and left weird install "packages" all over my HD. I was only able to see these after booting off of an external disk. No previous systems or Users were anywhere in the mess left from the mid-install failure. I bought a new 500GB HD and tried to install Leopard on that...also failed. I booted off of the external again and copied the "mess" from the internal HD to the new HD in case the internal factory HD failed or was failing.
Phone support said it was a bad DVD. Wrong!...I used that Leopard DVD on my G4 to create the external boot disk. I took the G5 into the Apple store and they couldn't install off of the DVD, or their mini-drive(s). They ran Disk Warrior and it went nowhere. They kept the G5 and replaced the HD but said they needed to "image" the OS Leopard onto the disk because the install failed. After picking the Mac up, I didn't think this was acceptable and returned the G5 which was sent out for testing. It was determined that it was bad factory RAM that was the culprit. RAM replaced.
Now my original internal HD with any historical hidden files or other "baggage" is gone (mistakenly-prematurely replaced) and Disk Warrior and DATA Rescue doesn't seem to work on these weird files that I copied from that original disk.
Naturally, this G5 (wife's new computer) was the only one in the house not backed up. I was installing Leopard to use Time Machine with my new Time Capsule. To add insult to injury, I'd recently talked my wife into using iPhoto and AppleMail. She will never forgive me for that! As much as I love the on board apps, I am finding it is inherently dangerous to have your eggs in those baskets because all the integrated Apps (iPhoto, Mail, stickies, iTunes, document folder, etc) were/are destroyed or "packaged up" in an upgrade and the 3rd party apps (and their ancillary files, mails,etc) were all fine. (Eudora, Adobe apps, etc.)
_If there is a way to "crack" open those files and get to at least the photos, that would be great._
Otherwise, I have learned 6 things from this experience. 1. Backup your photos, music and Document folder (minimum) today...and everyday. 2. Don't think that a simple iTunes update is necessarily innocuous. 3. Mac Genius is a title and job, not a degree or intellectual state. 4. Endorsing computer applications to your spouse is not necessarily a good idea. 5. A computer crash can lead to severe depression and other issues that will negate any quality of life advances you thought your computer had afforded you to date. 6. Backup everyones computer - today! I wish I felt better now, but I don't!

a true horror story. i can only commiserate. I'm not at all sure your pictures and other stuff are actually in one of the packages that are left but you can use [Pacifist|http://www.versiontracker.com/dyn/moreinfo/macosx/12743] to open them up and restore anything useful you find inside.

Macbook Snow Leopard Install Fails

I have been trying to install Snow Leopard on my cousin's macbook for like 2 weeks. I boot up to the install DVD and run the installation. It goes through the entire process all the way to the end and then I get a message that the installation failed with a restart button under it. I have tried doing disk repair and permission repair with disk utility and then running the installation but it still fails. I am at my wits end, I don't know what else to do. I wanted to do this because my cousin's computer was having issues booting. I couldn't even boot the Leopard 10.5 CD that came with her computer. But when I did the snow leopard dvd it boots up perfectly, it just won't install. She needs a computer and I need to not have to share mine with her because hers is broken. I am the only one in the house with enough know how to fix the computers when the break, so that's why I am fixing her computer. I am about ready to throw her Macbook out the window because I am so frustrated. It is 2 years old and shipped with Mac OSX 10.5 Leopard installed on it. It is newer than mine, which I have had for 3 years. Mine is working perfectly still and it is one of the ones that shipped with Tiger installed. Then I upgraded to Leopard, and then to Snow Leopard. I haven't had a single problem with it. I don't understand why her 2 year old computer is having issues when my 3 year old one is not. Especially when they are both Macbook 13" White laptops and look identical when you don't get a close look at the keys. That is the only difference, her function keys are a bit different than mine, and have the buttons for controlling dvd's on them, like play, pause, and rewind. Mine are just like volume, brightness and stuff like that and just normal function keys. Mine is older, if any of them was going to break it should have been mine, but hers is the one with all the issues. I don't get it! This is her second laptop, her first was a Compaq PC laptop and it got a ton of viruses on it and crashed. I suggested that her parents get her a Macbook because they work better and get far fewer viruses (if any at all) than PC's do and for a wonder, they did. She is always the one with the computer problems. I guess it's because she's a teenager and doesn't always take very good care of her stuff. I just don't know. I do know that I have a huge problem with her laptop and need help!!

It doesn't. It just starts up to the Macintosh Hard drive and doesn't do anything differently because I am holding the D key during start up.
For the D key to work one of two criteria must be met:
1. The HD has a hidden partition on it with the Apple Hardware Test (AHT) on it. Some recent Mac models come from Apple with this HD configuration, most older ones do not. Any drive that has been reformatted will not have the hidden partition.
2. An original grey system disc with the specific version of AHT for that Mac model must be in the optical drive. The disc itself will be marked to indicate that it has the AHT on it.
Retail OS installer discs (Leopard, Snow Leopard, whatever) do not have any version of the AHT on them. The AHT is not an application, it is a tiny operating system. Each version is designed only for specific models; they are not interchangeable.

Snow Leopard Install Failed on iMac

I have a late 2006 iMac and cannot get SL to install. Every time I try something different I still get the "Could not install the necessary support files" error. Here is what I have tried:
- Clean install of SL on erased drive (including a 7-pass erase), fail.
- Installed Leopard, then upgrade, fail.
- installed Tiger even, then upgrade, fail.
- Thought I had bad DVD, returned it to Apple store, new disk but same problems.
- tried my friend's disk that worked on his MB, failed.
-Per AppleCare rep I reset my SMC and PRAM, tried clean install, failed.
- Hard Drive verification cheks out fone.
- Permissions, fine.
- Apple Care reps now tell me that they are out of ideas and that I should bring it to the store, but I have found that the store "geniuses" are usually NOT that.
The only thing I have not tried is booting from an external drive. Have other iMac users with these problems with SL had success this way? I mean I don't like the fact that anytime I want to reinstall my operating software that I will have to go through this circus.
Any other ideas to try? What has worked for others?
Help!

A 2006 24" iMac should be the same as mine and I installed SL on 2 of them with no problems at all. It's really very weird that you should be having this problem even after reformatting the drive.
Only thing I can think of that might be causing this is hardware problems, most likely the DVD drive is going bad. Or perhaps the motherboard, but I think you would have had many more problems than this if it was the motherboard. You might even have a hard drive going bad, which seems unlikely after doing a 7 pass erase. That will usually isolate any bad blocks.
As someone said you can do a remote install from another Mac if you have one or can get the use of one. You could also try hooking up an external DVD drive and see if that works. Make sure it's firewire, that works much better, but USB 2 should still work if you have no choice. If a remote or external DVD works then it is most likely the the internal DVD.
Kevin

Leopard install fails with panic: "Unable to find driver for this platform"

I have an early 2006 20" iMac with OSX 10.4.11 installed. Running perfectly with latest Firmware, permissions repaired, just perfect. I now want to upgrade to OSX 10.5, so I insert the Leopard Install DVD, reboot, and then to my horror a kernel panic, screen goes black with message panic(CPU 0 ...): "Unable to find driver for this platform", with the usual boxed message about holding the start button.
Grateful for any help.

I finally managed to install Leopard by using a 2nd iMac to read the install DVD, and using firewire and Target Mode as described in http://reviews.cnet.com/8301-13727_7-10327225-263.html?tag=mfiredir . This seems to imply that the kernel panic is due to some hardware fault with my iMac's optical drive.

Mac OSX X Leopard Install Failed

So heres the story, i went to reinstall leopard on my power mac g5 dual 1.8 ghz and it says it failed because of something with additionvoices.pkg i need this machine as it is the only tower i have. PLEASE HELP!!!!!

1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
   2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
      *Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
   3. Click the Erase tab.
   4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
   5. Select your Mac OS X volume.
   6. Highlight the drive, select Partition Tab, then Format type... MacOS Extended Journalled, select the Security Options button, choose Zero Out Data, Erase... after completion do a new install.

Just got snow leopard install failed now Mac will not boot up?

I got a iPad and snow leopard very excited to use them I try to install leopard and it fails so I turn on the comp to try it again and I get the apple logo then the spinning wheel then it just shuts off and that's all it will do now!
Glad I got the iPad so I could post this!
Anywho I've tried all the command option P+R stuff so any other suggestions would be great!
Thank you

Try inserting the instalation DVD provided by Apple and start the computer while holding the 'c' key down on the keyboard until you hear the DVD spin and some action in the DVD drive. If your mac doesn't start and show something meaningfull then, take it back to the shop it has a hardware problem, or your installation disc has.

Snow leopard install fails on 17" MacBook Pro

I left the install disk running then came back to see the Apple logo screen - the machine will not boot into OS X of any number. On second try, the installer ran into an error and reported that MacOS cannot be installed on this disk!
I used disk utility to repair disk - it was ok except for a mention that SUID file "system/libray/coreServices/remoteManagement/ARAAgent.app/Contents/MacOS/ARDAAg ent" has been mdodified and will not be repaired. As well, the boot support sections would be made as required.
I then repaired the permissions - there was nothing too out of place there.
I am now making a disk image of my drive incase anything worse happens.
Sure hope I don't have the pain of recovering all my email and setting, passwords and junk from my disk image - should I have to erase to do a "clean install"
I read that Apple recommended installing Snow Leopard over the existing OS .. and cleaned-up detrius from previous installs.
Soundl like I have some trojan in my remote management - or some system fault is interfering with the install.

No, it sounds like you either have corrupted files or a problem with the hard drive.
The SUID message is irrelevant. Unless you are maintaining Windows systems from a Mac you are not even using Apple Remote management. However, the error is not reported by Disk Repair. It would be reported by Permissions Repair. You need to do both:
Repairing the Hard Drive and Permissions
Boot from your OS X 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 Installer menu (Utilities menu for Tiger and Leopard.) 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. Now restart normally.
If DU reports errors it cannot fix, then you will need Disk Warrior (4.0 for Tiger, and 4.1 for Leopard) and/or TechTool Pro (4.6.1 for Leopard) 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.
After you backup I would erase your drive and install Snow from scratch. I would reinstall your third-party software from scratch but avoid third-party add-ons such as contextual menu items, preference panes, startup items, login items, Internet plug-ins, input managers, and the like as some may or are not compatible with Snow.

Was upgrading from Leopard to Snow Leopard. Install failed. Now says I'm in 10.6 but I'm incomplete. Screen goes gray. Can't boot from disk.

Snow leopard install failed. Comp says I have 10.6.8 but get gray screen when trying to install.

Run through this list of fixes
Step by Step to fix your Mac

Leopard install failed: Incorrect # of Extended Attributes

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