Starting up in black console screen

My PB has just started booting up into a black screen. I get the grey Apple logo then the start-up progress bar - which seems a little quicker than usual - and then after a few moments of a blank blue screen, it goes to a black screen with the following text:
Darwin/BSD (localhost) (console)
login: Feb20 18:44:14 localhost mdsyncServer[190]: Could not create DiskArb session or approval session.
Feb 20 18:47:15 localhost mDNSReopsnser: mDNSPlatformSendUDP sendto failed to send packet on interfaceID 01808E00 lo0/4 to 224.0.0.251:5353 skt 9error -1 errno 65 (no route to host) 2219651482
This last section appears again after a few minutes...having tried again to do whatever it's trying to do.
I've tried to boot from the original OS disk but no joy. I've connected to my other PB in target disk mode and was able to see the HD. I then ran Disk Utility which showed up some errors:
Verifying volume “HD”
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Checking multi-linked files.
Checking Catalog hierarchy.
Overlapped extent allocation (file 58140 /Library/Image Capture/Devices/EPSON Scanner.app/Contents/Info.plist)
Overlapped extent allocation (file 566738 /Users/annabelbevan/Library/Caches/Safari/01/11/3035749139-2755198897.cache)
Checking volume bitmap.
Volume Bit Map needs minor repair
Checking volume information.
The volume HD needs to be repaired.
Error: The underlying task reported failure on exit
Disk Utility stopped verifying “HD” because the following error was encountered:
The underlying task reported failure on exit
1 HFS volume checked
Volume needs repair
I repaired the disk, verified it again and it came back free of errors.
I then tried the Hardware Test disk. Having selected the Test button and the right hand arrow I was left with a screen with the OSX folder and the folder with question mark alternating merrily.
I then tried the safe mode start-up without the Hardware Test disk and, having selected the OSX icon, went through the start-up screen with progress bar to the blank blue screen...and then to the black console screen.
The text on the black screen is slightly different now:
Darwin/BSD (andrews-powerb) (console)
login:
I'm all out of options now as I have no idea what to do past this stage. What's my login etc.
Is this an OS problem or a HD problem? Any thoughts anyone?
Thank you in advance of your replies.
Regards

Check out the information from Mike Coniff in this discussion topic for a possible solution. If you are unable to succeed then you will have to reinstall OS X. If the drive is OK you can do this using Archive and Install which does not erase the hard drive:
How to Perform an Archive and Install
1. Be sure to use Disk Utility first to repair the disk before performing the Archive and Install.
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.) 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, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior (4.0 for Tiger) and/or TechTool Pro (4.5.2 for Tiger) 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.
2. Do not proceed with an Archive and Install if DU reports errors it cannot fix. In that case use Disk Warrior and/or TechTool Pro to repair the hard drive. If neither can repair the drive, then you will have to erase the drive and reinstall from scratch.
3. Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When you reach the screen to select a destination drive click once on the destination drive then click on the Option button. Select the Archive and Install option. You have an option to preserve users and network preferences. Only select this option if you are sure you have no corrupted files in your user accounts. Otherwise leave this option unchecked. Click on the OK button and continue with the OS X Installation.
4. Upon completion of the Archive and Install you will have a Previous System Folder in the root directory. You should retain the PSF until you are sure you do not need to manually transfer any items from the PSF to your newly installed system.
5. After moving any items you want to keep from the PSF you should delete it. You can back it up if you prefer, but you must delete it from the hard drive.
6. You can now download a Combo Updater directly from Apple's download site to update your new system to the desired version as well as install any security or other updates. You can also do this using Software Update.

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