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.

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Error when REPAIRING DISK

"INVALID LEAF RECORD COUNT"
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Yup and in fact it's entirely possible NDD made it worse than helped. That's one of the worst pieces of software for OSX every to hit the market, I've never seen anything so incompetent and useless.
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R

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At the end of the repaitr, it says "Warning: SUID file "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAg ent" has been modified and will not be repaired."
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Hi Rob,
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So by now, I've figured out that I probably need a new hard drive. But here's the real issue. I haven't backed up my hard drive in quite sometime. It's been too long for me to just wipe my hard drive. I need it backed up immediately. I tried backing it up in disk utility, but the back up only gets so far then an error message pops up, telling me that the back up could not be finished because of an in/out error. My question is, how do I go about getting all the files on that hard drive onto another? What programs will work? What should I do? Also, I ran disk repair. It says it can not fix the issue.

'This last thing i remember trying to open a video in quicktime. Thats when everything went sour. Could that be the corrupted file?'
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I'm afraid that's unlikely. There's no magic way of increasing the likelihood of booting.
Your best hope is probably DiskWarrior (I have no connection with this firm); if it works then it's money well spent, but of course if it doesn't it's an added expense on top of any replacement disk.
And when you get this sorted out do institute a strong backup regime. Not backing up will inevitably eventually lead to the situation you now find yourself in. It's an area where paranoia pays. I maintain several different backups, including online for important data, Time Machine, and a couple of clones.

Invalid Node Error: What does this mean?

I have a white Macbook I purchased in September of last year, so the hardware warranty is still active. I did not purchase any extended care warranty, but am considering it now...
This past Monday, I was using my computer at one work site, then had to go to another. I shut it down, and when I got to my next destination (roughly 15 minutes later) I tried to power it up. I got the gray screen with the apple, the little wheel spinning below it, and after about two minutes of that, it shut down. That's all it has done since. It was working perfectly until then, as far as I could tell.
I have tried resetting the PRAM, taking out the battery and holding the power button down, running a hardware check, and booting from the installation disk. The hardware check said it detected no problems, but the disk utility consistently finds an Invalid Node error, and can't repair the disk. I can't verify either, for the same reasons.
Of course, I have nothing backed up. I would like to recover my data if possible, but I'd rather have a working computer with everything lost than neither. I have an appointment at a Genius Bar for tomorrow, but was wondering if anyone had any suggestions as to what this might be.
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Disk Warrior can repair the invalid node problem if it's not extensive. However, if DW is unable to repair the disk, then reformatting would be your only other option.
If you have a backup clone from which you can boot the computer then you can update the backup of your data files before reformatting the drive. If you don't have a backup (which you should,) then the following would be an option:
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What version of SAP Business One are you using?
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Invalid currency error when copying a Sales Order
Symptom
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Other terms
OINM,FIFO, zero cost, sales order ,delivery ,invoice
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Application error
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SAP plans to fix this issue in a future patch. See the info.txt file on SAP Service Marketplace to verify when the fix was included.
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What does the message "Warning: SUID file "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAg ent" has been modified and will not be repaired" when repairing disk permissions?

What does the message "Warning: SUID file “System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAg ent” has been modified and will not be repaired" when repairing disk permissions?

It's just a status message, albeit a misleading one, and can be ignored.
http://support.apple.com/kb/TS1448
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Perhaps, since you are under warranty, they may have a boot disk to attempt to run disk utility and see if the problem can be repaired before resorting to reformatting. Disk error may occur because of a number of issues (installed software, crashes, shutdowns, physical movement of the drive while disks spinning, etc.)
In addition you may want to boot in the single user mode to access the FSCK command as follows: The following is from the Apple support site
Mac OS X: How to Start up in Single-User or Verbose Mode
You may use a key combination when starting up the computer to enter single-user mode or verbose mode, either of which can be used for troubleshooting and in software development. This document applies to Mac OS X and Mac OS X Server versions 10.0 and later.
Steps to Enter Single-User or Verbose Mode
1. Shut down the computer if it is on.
2. Press the power button to start the computer.
3. Immediately press and hold the Command (Apple) key and one of the following:
the "s" key for single-user mode.
the "v" key for verbose mode.
4. To exit single-user mode type: reboot
5. Press Return.
You have successfully entered single-user or verbose mode when you see white text appear on the screen.
Then you may try to repair as follows using the FSCK
fsck is a command-line utility that may be able to verify and repair a disk. If you can successfully start up in Safe Mode or use Disk Utility while started up from a disc, you don't need to use fsck. However, here are some situations in which fsck may be necessary.
Your Mac OS X disc isn't available.
Your optical drive isn't available.
You can't start with a Safe Boot.
Tip: If you use a Mac OS X Extended (Journaled) formatted volume, such as with Mac OS X 10.3 or later, you probably won't need to use fsck. If you do use it for any reason, please be aware that benign error messages can appear.
If you're not sure how your volume is formatted and you can't start up from your Mac OS X volume to find out, type the following command in a command-line interface and then press Return: diskutil info /
If you see "File System: Journaled HFS+" returned, you have a Journaled volume.
To use fsck, you must run it from the command line. Unlike using your mouse to open an application to do something, you'll need to type a text command at the prompt (#) to tell fsck what to do. The Terminal application (/Applications/Utilities) and single-user mode are two examples of command-line interfaces in which you can type such commands. To use fsck:
Start up your computer in single-user mode to reach the command line.
Note: If necessary, perform a forced restart as described in the Emergency Troubleshooting Handbook that came with your computer. On desktop computers, you can do this by pressing the reset/interrupt button (if there is one) or holding down the power button for several seconds. On portable computers, simultaneously press the Command-Control-power keys. If your portable computer doesn't restart with this method, you may need to reset the Power Manager.
At the command-line prompt, type /sbin/fsck -fy
Press Return. fsck will go through five "phases" and then return information about your disk's use and fragmentation. Once it finishes, it'll display this message if no issue is found:
** The volume (nameofvolume) appears to be OK
If fsck found issues and has altered, repaired, or fixed anything, it will display this message:
*** FILE SYSTEM WAS MODIFIED ***
Important: If this message appears, repeat the fsck command you typed in step 2 until fsck tells you that your volume appears to be OK (first-pass repairs may uncover additional issues, so this is a normal thing to do).
When fsck reports that your volume is OK, type reboot at the prompt and then press Return.
Your computer should start up normally and allow you to log in.
About live verification in Mac OS X 10.4.3 or later
In Mac OS X 10.4.3 or later, you can verify your Mac OS X volume while started from it. This is known as live verification, and can be used in three different ways.
Option 1: Verify your disk using Disk Utility while started from the startup disk. To find out how to do this, see this article. Please note that live verification does not involve any disk repair, so if verification finds something that should be repaired, start up from your Mac OS X Install disc and use Disk Utility as described above in "Try Disk Utility."
Option 2 (advanced): Use the command line and the command-line utility, diskutil.
Start up your computer and log in as an administrator.
Open Terminal (/Applications/Utilities).
At the prompt, type the following command and then press Return:
diskutil verify /
Note: Don't use this method to check non-startup volumes.
You should see messages such as the following during the disk check:
Could not unmount disk for verification, attempting live verify
Started verify/repair on volume disk0s3 Macintosh HD
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Checking multi-linked files.
Checking Catalog hierarchy.
Checking Extended Attributes file.
Checking volume bitmap.
Checking volume information.
The volume Macintosh HD appears to be OK.
Mounting Disk
Verify/repair finished on volume disk0s3 Macintosh HD
Option 3 (advanced): Use the command line and the fsck_hfs -l command.
Start up your computer and log in as an administrator.
Open Terminal (/Applications/Utilities).
At the prompt, type the following command and then press Return to determine your filesytem ID:
df -hl
Look for some lines of text that look like this:
Filesystem Size Used Avail Capacity Mounted on
/dev/disk0s3 37G 20G 17G 55% /
/dev/disk0s5 37G 37G 641M 98% /Volumes/Storage
Make a note of the first "disk" name that appears after /dev/, such as "disk0s3." This is your filesystem ID for your startup volume.
At the prompt, type the following command and then press Return:
df -hl
Then type the following command, where "disk0s3" is your filesystem ID you noted in step 4, then press Return:
sudo fsck_hfs -l /dev/disk0s3
When prompted, enter your admin password, then press Return to begin the verification.
You should see messages like these during the disk check:
** /dev/rdisk0s3 (NO WRITE)
** Root file system
** Checking HFS Plus volume.
** Checking Extents Overflow file.
** Checking Catalog file.
** Checking multi-linked files.
** Checking Catalog hierarchy.
** Checking Extended Attributes file.
** Checking volume bitmap.
** Checking volume information.
** The volume Macintosh HD appears to be OK.
Additional Information
If you're interested in UNIX-style command-line syntax, here's a look at how a couple of flags used in our instruction can influence fsck:
The -y flag: Tells fsck that you want to answer "yes" to all questions about fixing, repairing, or salvaging information. This is the optimal approach, as answering "no" to any question causes fsck to stop. You cannot determine that all necessary repairs have been made until fsck completes and gives its final report.
The -f flag: Forces fsck to check "clean" filesystems when preening.
Macbook Pro 17" 7200 HD 1GB Powerbook G4 (15 inch FW 800) Mac OS X (10.4.6)
Macbook Pro 17" 7200 HD 1GB Powerbook G4 (15 inch FW 800) Mac OS X (10.4.6)
Macbook Pro 17" 7200 HD 1GB Powerbook G4 (15 inch FW 800) Mac OS X (10.4.6)

Invalid Node Error When Repairing Disk - Reinstalled & came back

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