Persistent "Invalid Node Table" - hardware problem?

I have a very odd problem.
About 4 weeks ago, my mac was having problems opening programs and continually freezing - a disk utility check showed an "invalid node table", so I formatted and reinstalled Mac OS X and everything worked fine for about a week.
Now I have had this happen 4 more times in as many weeks, and I'm starting to think there might be some problem with my hard drive; in the days before the first problem I had about 4 power surges; although my Vista boot camp partition seems to not be affected by these issues.

Did you reformat the whole disk or just the Mac partition? I had a similar issue a month ago and since there were no signs that anything was wrong with my Boot Camp partition I wiped the Mac partition only -- but the problem wasn't cured until I reformatted the whole disk.
Simon

Similar Messages

  • IMac (March 2009) - Invalid Node Structure problem

    Hi All
    I was using my iMac as normal yesterday, when suddenly the system ground to a halt (something I never seen since using OS X). As I had work to do, after about an hour, I restarted, expecting it to be an app misbehaving or something straight forward, but on restart the same thing happened almost straight away.
    So, I restarted again, only for the iMac to get stuck on the blue screen which follows the grey 'cog' screen. After looking through these discussions, and some other Mac forums, I booted from the installer disk, tried to run Disk Utility, which found issues and couldn't repair the disk.
    I then tried Safe-User mode and fsck, which reported the aforementioned Invalid Node Structure problem. After checking a few more forums, I thought I would try to Erase the disk and reinstall Mac OS. I restored from my Time Machine backup, and finally got it to start, but the system moved at a snail's pace, and wouldn't open any apps or files.
    I've tried again with fsck, and also fsck_hfs -r /dev/disk0s2 but all I get is the same error message:
    disk0s2: I/O error.
    Invalid Node Structure
    (4, 38403)
    ** Volume check failed.
    /dev/rdisk0s2 (hfs) EXITED WITH SIGNAL 8
    So, does anyone know if there is anything I can do to save the iMac? Or does it need a new HD? It is my primary work computer, so I really need to get it back, and after buying it in the UK, am now in France for 6 weeks, so it's difficult for me to take it to an Apple specialist.
    Any help would be greatly appreciated, thanks in advance,
    Daniel

    As the last user stated, Disk Warrior maybe able to correct it, however if you search the net, you will see there are more than one user with this problem. I had the same problem, however, my machine is out of warranty, It started like you are saying, I RAN disk warrior which corrected the problem long enough to boot the system. In a matter of 10 minutes or so, the system started pausing (apps hung, but in a matter of seconds recovered). I was checking the disk with fsck_hfs and fsck while booted from a USB drive with a maintenance install of 10.5.6. After running fsck the 5th time with different options suggested from the internet, I rebooted with my disk warrior DVD only to find the drive NOT mounted, Drive utility see's it (even can attempt to run disk repair, but it locks up the system when trying this). Disk Warrior doesn't even see the disk to run a directory repair, although in the "check s.m.a.r.t status it sees it as a sata device, and SAYS ITS NORMAL).
    Since my iMac was out of warranty, I followed the online instructions to replace the hard drive (not too difficult) and everything is fine now.
    The old drive still wont mount, but another utility I bought (data rescue II) has been able to quick scan it and access all the data, even though it wont clear a fsck fsck_hfs or disk warrior, anyways, get it back while you can, IT IS THE hard drive itself, and lots of other iMac users online with the same issue (can you say WHY is my iMac SOOO HOT on the apple in the back (right where the drive is and not sufficient cooling in my opinion, but hey, some people might want to lay their computers face down and fry eggs on the it or something... ))
    -SD

  • Problem when booting - Invalid Node Structure

    Hey!
    I decided to put my MacBook G4 up to date. So I installed several updates of my software. So far so good. Then I tried to check with Disk Utility wether there were any problems on the file system. I ran "repair Disk Permissions" and some errors where found and corrected. I tried "Verify Disk" and it announced there where some errors namely "Invalid Node Structure". As I couldn't repair the disk as it was the current boot disk I decided to run Disk Utility from a CD. Unfortunately I didn't have my original cd so I asked a friend to use his. He gave me his "MacBook Pro - Mac OS X Install Disc"s (Mac OS X 10.5) and I ran it on my PowerBook G4 (Mac OS X 10.4 installed). It gave the same result like when I ran it from my hard drive. When I tried to repair it, it started and stopped after some seconds (between 20 and 40 seconds) saying it was unable to repair it.
    After that the computer does not mount from hard drive (10.4 installed) anymore, only from cd. I tried booting in single user mode and executing /sbin/fsck -fy but I had the same result ("disk0s10: I/O error. Invalid node structure (4, 7698) **Volume check failed.").
    I think I can resolve the problem by starting my mac in firewire mode, backing up my data and reinstalling Mac OS X (would a repair from 10.4 Disk Utility work?) but I would be happy if there were any faster / more elegant way to do so as I cant use my install cds for 10.4 right now as I am in an other country for some time.
    Any help?

    Hi Ja!, and a warm welcome to the forums!
    Unfortunately DU & fsck can't fix all that much, your best bet is DiskWarrior, you need the CD though.
    http://www.alsoft.com/DiskWarrior/
    If DW can't fix it, you might try Data Rescue II...
    http://www.prosofteng.com/products/data_rescue.php
    (Has a Free Demo to see if it could or not, but you'll need another drive to recover to).
    Or FileSalvage...
    http://www.subrosasoft.com/OSXSoftware/index.php?%20mainpage=product_info&productsid=1
    to recover what you can.
    PS. Don't use Leopard Install Disk to work on Tiger Hard disks, it's always messed up my Tiger Disks ehen I did.
    Also, not a good idea to even Repair Permissions if there are Disk problems like you have, you don't want to write anything to a disk that has problems, that means even trying to boot off it until you fix it.

  • Huge problems with my MacBook:  Invalid Node Structure and More!

    A couple days ago I was browsing the internet, and when I closed Safari, the system froze. I couldn't even force quit out of anything, so I had to shut it off manually. When I tried to turn my computer back on the next day, I couldn't get past the Apple screen. The little wheel would keep spinning, but I could never get anywhere.
    Then, I tried to boot from the Leopard DVD to possibly reinstall Leopard, hoping it would work. At first, no drives would show up to install to, but for some reason, they eventually showed up. Problem is, I don't have enough free memory to reinstall Leopard. Furthermore, I've tried to fit it on the space I have, and it says that the install failed, so I can't reinstall Leopard.
    I also went to Disk Utility from the DVD and tried to repair the disk. The only option available was to Verify Disk, but when I go there, that fails, and it says "invalid node structure."
    I'm not sure what happened to my computer because it seemed to come from nowhere. To sum up, I cannot log in to OS X, or even XP on a separate partition, I can't reinstall Leopard, and I can't repair the disk. I've read about how DiskWarrior might help, but I can't get in to OS X. Does anyone have any idea what happened or what I can do? I haven't backed anything up, so if I'm screwed, then so be it, I guess. Just wondering if anyone has any explanations or suggestions. Thanks.

    Interesting how many people have this same issue. A friend of mine has brought me her white Macbook Intel Core 2 with Leopard and it had a folder with a question mark instead of the apple at startup. I was able to boot using the Mac Install DVD and ran Disk Utility. It said something like "Invalid Node Structure" and "Cannot Repair". Unfortunately DiskWarrior will not fix this. I tried it to no avail. I'm resigned to the fact that a new hard drive is necessary.
    The HD in there is a Hitachi 120GB.
    It also wouldn't let me erase the disk nor partition it. Then, one morning I woke up and it was able to erase! So I erased, then installed Tiger. It seemed to be working fine. So I rebooted from the Leopard drop-in disk and installed Leopard. Then I restarted, and BAM! back to the question mark folder. Now I'm back to where I started. Other threads
    I forgot to mention that my friend had photos and music on the HD that she couldn't do without and I was able to recover that data using Data Recover II. First I had to use SuperDuper to clone my own computer onto an external drive so I could use it as a boot drive.
    For now the only solution is to buy a new internal hard drive and reinstall the OS. And regularly backup!!
    So I guess this issue has not really been solved, but hopefully you have warranty. Unfortunately for my friend, this happened a week after her warranty expired.
    Good luck.

  • Kernel panic/invalid node structure; please help retrieving my files!!

    Hi everyone, thank you for your time in advance... if anyone has ideas about how to solve it, I appreciate this very much!
    OK, here is how it began: while I was working on the airplane using PowerPoint, the gray spinning wheel appeared after which PowerPoint stopped working. I pressed the power button to exit (all applications froze). (So much for trying to get more work done...)
    Next, I powered up the computer but it would not boot up, with only gray spinning wheel showing.
    Next, tried to boot up while pressing power button and holding shift key. After some time (10 minutes), an error message appears. Researching it on discussion forums, I found that it is called “kernel panic”. Here is beginning of the message:
    panic(cpu 1 caller 0x47f5ad): "Process 1 exec of /sbin/launchd failed, errno 8\n"@SourceCache/xnu/xnu-1504.15.3/bsd/kern/kern_exec.c:3145
    Debugger called: <panic>
    [additional information here]
    Also, message “You need to restart your computer. Hold down the Power button until it turns off, then press the Power button again” is shown transparently in the middle of the screen over the “panic” message output.
    I turned on and off the Power button many times, but I get the same error message.
    I also tried Apple Hardware Test but it did not work (it did not generate any messages).
    Next, I tried to use the Disk Utility using the Installation Disk that came with the computer. After I clicked “Disk Repair”, here is the log:
    Verify and Repair volume “Macintosh HD”
    Checking Journaled HFS Plus volume.
    Checking extents overflow file.
    Checking catalog file.
    Invalid node structure
    Rebuilding catalog B-tree.
    Invalid node structure
    [many repeats of “Invalid node structure”  ~ about 400 repeats]
    Rechecking volume.
    Checking Journaled JFS Plus volume.
    Checking extents overflow file.
    Checking catalog file.
    Missing thread record (id=18)
    Missing thread record (id=110)
    [many instances of “Missing thread record” ~about 200 repeats]
    Checking multi-linked files.
    Checking catalog hierarchy.
    Checking extended attributes file.
    The volume Macintosh HD could not be verified completely.
    Error: Disk Utility can’t repair this disk…disk, and restore your back-up files.
    At the end, a window presented over the error log stated :
    “Disk Utility stopped repairing “Macintosh HD”
    Disk Utility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your back-up files.
    I need to retrieve my recent files!! Please Help!! Argh!! I promise that I will promptly back up my files now! I did not use Time Machine, and only some of my files are backed up.
    From what I read on the discussion forum, I will probably need to erase the disk and then do a fresh installation, but could someone please guide me with regard to how to back up the data / retrieve the files? I may have access to another mac so I’m thinking that the FireWire Target Disk Mode may work. I also have spare external harddrive (formatted for mac) (not partitioned). Also, how do I retrieve the files from the other computer if the FireWire transfer works?
    Also, the second step is to do a new installation, but is there any reason why “Archive and Install” using Disk Utility won’t help? I have some additional programs installed (Illustrator, Photoshop) so this means if I do a new installation, I will need to re-install those as well?
    I did some investigation, and it looks like this problem is similar to this:
    https://discussions.apple.com/message/18098343#18098343
    But my main issue now is to retrieve the files!
    Also, how do I investigate whether this problem is due to a failing hard drive or a natural file system corruption ? (so should I get a new harddrive or do a new install).
    http://forums.macnn.com/t/459376/heart-attack-invalid-node-structure
    I don’t know what is the OS version;  it is Snow Leopard OS X ……. I bought it in September 2009.
    I appreciate any help, thank you so much for your time…

    Create a data recovery/undelete external boot drive
    Step by Step to fix your Mac
    Most commonly used backup methods

  • Invalid node structure. Free solution!

    Invalid node structure. Free solution! Jan 2007.
    Disk problem on an Intel Core Duo Macbook with 1.25 gig RAM and updated to OS X Tiger 10.4.8
    Background.
    About a month ago I ran into a problem with expose behaving oddly and after posting a question on this forum, the very helpful Dr Smoke advised me to clear my caches and to run 'repair disk.' from the installation CD. (This because I reported that a couple of times I had to do a hard reset.) I got expose fixed but discovered that my disk had serious errors in the directory structure, reported as "invalid node structure," and which Disk Utility could not repair. The laptop was running perfectly but several people posted advice that I should not leave this problem unattended to. Reporting this crisis again on the forum I was advised to buy Disk Warrior for a whopping $100 for what might be a once in a lifetime problem -or else I should back up my data and re-install everything. And I thought the Mac was more stable!! Up to 6 months ago I was a Windows user who often had such problems with the FAT but I was always able to cure them with Checkdisk or Scandisk. In fact MS Windows repaired it automatically after a hard reset. I feel that it is most unfair for Apple to not provide an effective utility to correct this kind of disk corruption. They bundle wonderful programs like iPhoto and iWeb but leave you in the lurch with a fundamental disk problem. With help again from Dr Smoke, I made my firewire disk bootable for Intel Macbooks (must be partitioned with the "GUID" option selected) and searched the forums for a way to get going again without forking out $100. I wouldn't mind if it was a program that did other useful jobs like on-the-fly partitioning but it was going to be an overkill for me. Learning a little from each of several other posts (sorry I didn't record the links) I put together the following solution which is easy to execute and the time consuming elements can be left to run at night or when away from the computer. You may see possible short cuts as you read through to make it even simpler, but here is my full story! Actually I was travelling around Eastern Europe and couldn't easily get disk Warrior or Tech Tools sent to me. I needed to find a solution from reading advice and downloading disk utilities off the Web.
    I have a 40 gig ext. disk, mounted in a "hotdrive" enclosure which is useable either as firewire or USB 2. http://www.byteccusa.com.
    My Bacbook disk is 60 gig but only 25 gig was in use.
    My Macbook was up todate with every part of OS X including the firmware. except for Garage band which I do not use.
    Step 1a. I downloaded 2 free disk cloning programs - Carbon Copy Clone and SuperDuper. I preferred the latter. Step 1b I read about Migration Assistant - part of OS X Tiger.
    Step 2. I partitioned the Firewire disk in two (32 and 8 gig) for future convenience, and zeroed the disk after Dr Smoke's advice.
    Step 3. I installed the basic OS X package onto my 8 gig "Firewire 2" using only Install (DVD) disk 1 which takes up less than 5 gig. (In Setup one chooses to not install the additional programs - iPhoto etc.) I checked that I could boot from it and that it was healthy by running "verify disk" when booted from the internal hdd.
    Step 4. While booted from my internal HD, I cloned Firewire 2 onto Firewire 1 (32 gig) I verified the disk (no problems) then booted from it and assured myself that I had a fully working copy of OS X.
    Step 5. I booted from firewire 1 and used Migration Assistant to import EVERYTHING - files, programs, the lot, from my internal HDD with the node structure problem. My firewire disk was now 25 gig the same as my internal HD. It had now two users, both shown as administrators. I booted to my newly-imported user ID - the original one that was on my internal HDD. The only problem reported by Migration Assistant was that Missing Synch for Palm might need to be re-installed which would not be surprising given what it does. Later when all was done, I discovered that the migrated programs had been placed in a folder on my desktop so I opened it and moved them all into the 'normal' Applications folder created by my new basic install. (Some programs don't like running from anywhere other than the Applications folder.)
    Step 6. I worked from Firewire disk 1 for a day, trying out every program and it was working normally. One thing I noticed was that iTunes seemed to import as the original tiger 10.4.6 version so I needed to install the update to 7.02 which I had kept in my download folder. I tried to install the OS X update to 10.4.8 but a dialog informed me that I could not do that on this (external) disk. I don't know why, but later on I updated to 10.4.8 overnight using Mac Update.
    Step 7. Make sure all your data has been backed up somewhere, and that there is nothing of value on your internal disk. Take a deep breath, and wipe it!! I did this using Disk Utility (from Firewire 1) and took the chance to partition my HD into 32, 18 and 6 gig. I chose GUID partitioning and zeroed the disk. No going back!
    Step 8. I booted into Firewire 2 and installed SuperDuper. Then, from Firewire 2, I cloned Firewire 1 onto my internal HD 1 partition of 32 gig. SuperDuper does not call it cloning but rather 'copying all files.' It booted and works fine (as of Jan 10). Then I verified the disk when booted from one of the firewire partitions and all was well. Phew!
    I ran sofware Update and it offered to update Java, OS X for Intel, Garageband and Quicktime.
    So my node structure is cured and my internal hdd is partitioned without spending a penny and without having to re-install my programs one by one.
    Note: There may be a few things to re-install or some prefs to reset but in general this method worked well. I mentioned having ro re-update iTunes.I also had to reset the Quicksilver prefs, and maybe I will yet come across something needing to tweaked again. (QS is a free launcher.) Oh yes, FireFox did not run well so I re-installed it.
    I share this in appreciation for the help of Dr Smoke and others who answered my questions and for those whose posts were helpful to read, and for the benefit of others who may find them selves in the same predicament as me. And, oh yes, the trouble was not enough to cause me to go back to that other OS! Louis J
    macbook Intel 13" Mac OS X (10.4.8) 2 Ghz model with 1.25 gig RAM

    Invalid Node Structure is not a hardware failure, it never was (you may still have a hardware failure, but the Invalid Node error is not indicative of this problem. 
    Still, Disk utility will certainly fail to fix it, and DiskWarrior will probably fail too.  
    But don't despair.  Try this, and don't give up till you've tried it at least three times.
    First, get the name of the partition of the failing volume.   You can get it most easily by finding your disk in Disk Utility, selecting your partition (not the drive) and type cmd-i.    Look for "Disk Identifier" right at the top.
    Then,  open up Terminal, and type this:
    sudo /sbin/fsck_hfs -yprd /dev/disk5s2 
    substituting your disk identifier for the one already here.   Keep the "/dev/" part.   Enter your password, and wait.  It may take a while.  I have had this fail several times before finally working so its important to keep trying.   It's faster than a reformat!!!
    If the afflicted disk is your startup disk, you will need to do this in recovery mode: restart the computer, hold down option, and wait for the disk options to appear.   Select that, then proceed to Disk Utility and then Terminal as described above.  
    Good luck, and always keep a backup!
    chris watts

  • IMac refuses to boot properly - hardware problem?

    Hi all, I'm having some problems with my iMac (purchased last October) and was hoping some kind soul could shed some light.
    Here's where I'm at now.
    - The iMac doesn't boot. When I press the power button, it chimes, but then nothing happens and I just see the white/grey screen.
    - I have disconnected all 3rd party peripherals, and only have original keyboard and mouse attached.
    - No matter what keyboard combo I try, nothing happens either. I managed to eject the disc once by pressing the mouse button, but no other key combos work.
    - I must have rebooted about 30 times now, and only twice did something happen:
    1. Once it sat on the white screen for a bit, and then displayed a grey folder with a questionmark in it, but then nothing else happened.
    1. Once I did get it to boot from the CD, and I got to the installation screen. At this stage I tried a couple of different things. First I tried Disk Utility, and the HD is indeed listed in the sidebar (although it's listed as 'disk0s2' rather than 'Macintosh HD'. When I picked the First Aid tab, both Repaid Disk Permissions and Verify Disk Permissions are greyed out (i.e. I can't press them). When I went to press Repair, I got the following error message.
    +Verify and Repair disk 'disk0s2'+
    +Checking HFS Plus Volume+
    +Invalid node structure+
    +Invalid record count+
    +Catalog file entry not found for extent+
    +Volume check failed+
    +Error: The underlying task reported failure on exit+
    +1 HFS volume checked+
    +1 volume could not be repaired because of an error+
    So, I could do nothing in Disk Utility. I then thought "well, I'll just surrender then and reinstall OS X", but when I went back to the Install screen and proceeded, and it asked me where to install the OS, there was nothing to choose from. Usually 'Macintosh HD' is listed along with any other disks. Not this time. So, I shut down the computer again, and now I can't back to the screen (i.e. it refuses to boot from the CD again and instead just spits out the disc).
    So then I phoned Apple. But because I don't have their service plan (and the free one only lasts 90 days after purchase), he couldn't help much. He did say though that if it spits out the disc, it could be hardware problem, and my warranty would cover it.
    So, should I just give up, realise my HD is screwed and my data is gone, and hand it in for service? Or can anyone here shed some more light on my situation?
    Even a "yes, you're screwed, hand it in" would suffice, if that's indeed where I am.
    Thanks,
    Hanna
    Edited for spelling by Nunis

    Thank you, dwb. I did just manage to boot from the DVD again, but again I'm seeing the same problems.
    Screencaps:
    http://nunis.net/misc/screencaps/boot.jpg
    http://nunis.net/misc/screencaps/boot2.jpg
    And I have been backing up, but I just got back from vacation, so my last backup is 2 weeks old and the things I was worried about saving was the work I did on my vacation photos and video. Also, you'd be kicking a girl when she's down, which would be even worse.
    I think I'll definitely hand it in now, and ask the tech to rescue whatever data he can. I don't care if it costs me a bit, if it means rescuing my vacation photos.
    Thanks again, you've been most helpful.

  • I have an error of invalid node structure

    I have an error of invalid node structure.  Can I save my data from my hard drive? Is it even fixable?

    Invalid Node Structure is not a hardware failure, it never was (you may still have a hardware failure, but the Invalid Node error is not indicative of this problem. 
    Still, Disk utility will certainly fail to fix it, and DiskWarrior will probably fail too.  
    But don't despair.  Try this, and don't give up till you've tried it at least three times.
    First, get the name of the partition of the failing volume.   You can get it most easily by finding your disk in Disk Utility, selecting your partition (not the drive) and type cmd-i.    Look for "Disk Identifier" right at the top.
    Then,  open up Terminal, and type this:
    sudo /sbin/fsck_hfs -yprd /dev/disk5s2 
    substituting your disk identifier for the one already here.   Keep the "/dev/" part.   Enter your password, and wait.  It may take a while.  I have had this fail several times before finally working so its important to keep trying.   It's faster than a reformat!!!
    If the afflicted disk is your startup disk, you will need to do this in recovery mode: restart the computer, hold down option, and wait for the disk options to appear.   Select that, then proceed to Disk Utility and then Terminal as described above.  
    Good luck, and always keep a backup!
    chris watts

  • Recurring Invalid Node Structure

    Hello All,
    My Macbook Pro is just 9 months old. It started getting extremely slow and gets hung periodically. Checked the logs. It is showing Disk I/O error. Ran disk utility with the Mac OS installation disk. It shows "Invalid Node Structure".
    I then erased all data from hard drive by Zeroing out and reinstalled OS. It starts running fine but only for few days. It gives the same problem again. I tried fcsk utility also from single user mode. it resolves the problem but only for a few days. The problem appears again!!
    I thought erasing and reinstalling would resolve the problem unless the hard drive needs to be replaced.Any suggestion would be very helpful.
    Thanks,
    Sopan

    Recurring Invalid Node Structure problems can sometimes be well nigh unrepairable, Sops. They sometimes indicate progressive failure of the drive itself.
    I'd be inclined to download the trial copy of "SMART Utility" from http://www.volitans-software.com/smart_utility.php and test the drive with it to make sure this isn't essentially a hardware problem with the drive before accepting the 'SMART" status from Disk Utility . SMART Utility provides much more information in a situation like this, and, though it can sometimes be almost too "critical" , in a situation where you have already tried zeroing without success I'd be inclined to believe it.
    With the price of drives down where they are today it probably makes sense to simply get the drive replaced if you run into recurring issues of this kind. In your case you are still under hardware warranty anyway. It is very frustrating to spend hours or days sorting out a drive with "Invalid Node Structure" only to find it recurs a couple of weeks later anyway because it has a hardware defect.
    Cheers
    Rod

  • Invalid Node Error When Repairing Disk - Reinstalled & came back

    Hi. Thank you for any help you might be able to give.
    Last Friday, I had to shut down my macbook using the power button. It had been running slowly and I couldn't get applications to open. When it came back up, it flashed an "anti" sign. Eventually it started flashing a folder wtih a question mark on it. I booted from the disk and tried to repair it. It froze halfway and I had to restart. I repeated the process, but the disk utility could't repair it. Instead the disk utility told me that there was an invalid node and it couldn't repair it.
    I erased the harddrive (the quickest way, not completely) and reinstalled mac os. The computer has been working really well for the past 3 days.
    But the problem is back. I turned on my computer this morning to find the gray screen -.- It started flashing the folder with a question mark on it.
    Do I need to replace the harddrive? Would that fix the problem? Or is there something else that is causing this problem?
    Thank you for any advice.

    It certainly could be a problem with the drive, but it could also be a RAM problem (bad RAM can cause intermittent memory failure during disk writes causing the directory to become corrupted.) You can check the SMART status of the drive in Disk Utility. If the SMART status does not say "Verified" then the drive is failing. You can also run the Apple Hardware Test:
    Insert the original OS X Installer Disc One that came with the computer. Restart the computer and after the chime press and hold down the "D" key until the diagnostic screen appears. Run the extended diagnostics repeatedly for at least an hour to be sure you pick up any intermittent problems. Note any error messages down for later reference. If there are errors you will need to report them to the Apple tech at your local Apple service center or to AppleCare.
    I would also check your console and crash logs using the Console application in the Utilities folder. Check log entries, if any, around the moment that the computer crashed or locked up to see if there were any entries that may provide clues to the cause of the crash.

  • Macbook Leopard 10.5 is not booting up and not even getting Verified Error : Invalid Node Structure

    Hey, I am using Macbook Leopard 10.5, Yesterday while i was working it was on low battery i thought to connect it later, but all of a suddent its stopped fucntioning and everything goes blank. I thought it might be a Battery problem, but even after connecting charger for 2-3 hours, its not booting up. Only the Apple screen comes and then it goes shut down automatically.
    I even tried to fix it using Apple CD, Disk utility, When i tried to Verify the disk It shows following error :
    Disk cannot be repaired or verify.
    And details : Invalid Node structure
                        Volume needs to be repaired error : Filesystem verify or repair failed.
    I have very important Data on this disk, so i cannot even erase it.
    Suggest me somehting. It have enough space to install new OS but System shows you need erase it.
    I have tried to use Apple Hardware test by Holding D key, But its not working.

    Helloi
    http://supportdb.alsoft.com:591/FMPro?-db=alsoftsupport&-lay=main&-sortfield=Dat e&-sortorder=descend&Keywords=node&Product=%22%22&-op=lte&Date=%2F%2F&-max=15&-f ormat=AlsoftSupport-qa.html&-script=counter&-token=177&-Skip=0&-find

  • What's an invalid node structure?

    I dropped my ibook and now it won't start correctly -- it gets stuck on the apple with the loading sign. I took it in for service where they said my hard drive was damaged and possibly my logic board too. Since that repair was going to be too expensive to be worth it, I took the computer apart myself to try and replace the hard drive. But the hard drive works perfectly when plugged into another computer. So I backed up all my files, put the ibook back together again and tried to fix it. Disk Aid says I have an "invalid node structure." Does anyone know what that means for my poor laptop?
    If I start up my computer now I get the Mac smiley faces and a folder with a question mark on it. I tried resetting PMU and PRAM but that didn't seem to accomplish anything.

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