Disk utility reports "unused node is not erased" after installing 1TB HD

Hi there,
I just installed a brand new 1TB HD into a 2006 Intel iMac. I booted from the Snow Leopard installer DVD and tried installing the OS, but I received a kernel panic. I rebooted from the installer DVD again and ran Disk Utility which reported multiple instances of "unused node is not erased" and could not repair the disk. I re-partitioned the disk but each time Disk Utility gave the same error. I rebooted from the DiskWarrior DVD and rebuilt the directory (DW found no errors). I then rebooted from SL DVD again and ran Disk Utility which found the same "unused node is not erased" errors but this time was able to repair them! I'm now trying to reinstall the OS for a second time.
I'm wondering from this bizarre behaviour whether
a) I have a faulty (new) HD
b) there might be something else wrong with my mac causing these errors.
Any assistance would be greatly appreciated!
Cheers,
Greg

Well, I attached another good external drive via FireWire, booted the 2006 iMac from the SL installer DVD, partitioned it with DU, then ran DU Repair Disk, and Disk Utility immediately gave me "unused node is not erased" errors and was unable to repair the drive.
I attached the same good external drive via FireWire to another Mac and repeated the same procedure: this time DU gave me no errors at all.
I'm going to assume my 2006 iMac has a faulty logic board or SATA controller (with cost of repairs probably more than the computer is worth). Would you agree?
Thanks again!

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