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.
I appreciate any help!

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:
If you have access to another Mac with FireWire, then you can use Target Disk Mode to access the drive and backup your data files, provided the drive is accessible.

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