How to extract info from an almost diseased HD?

Hi,
My mac won't boot up it and after a silent "burr" sound, it shuts itself down during the grey "apple"-screen (while the gear is spinning). I have tested all the tips I could find on this forum and others (incl. resetting the PRAM, starting in Single user mode, in Safe mode etc.). It seems to me that my hard drive is dead (or hopefully almost dead)...
When I try to do Repair Disk through my installation disc it says there is an error with the HD and it can't repair it. My HD is visible in the Disk Utility – (but i.e. not on someone else's desktop in Target-mode.). I cannot mount the disk in Disk Utility and I can't copy the disk as a disk image.
Is there any other way I can copy or extract the info on my HD (I need some files that weren't backed up)? Perhaps you have some tips for more advanced software? I don't want to go to a Data Recovery shop yet... Please help.
Cheers,
Mat.

Mat:
Disk Utility reports "Underlying task reported failure" when repairing a volume is a serious directory/file structure error that, as you have learned, cannot be repaired by Disk Utility. The article linked suggests the use of third party software, which we have noted earlier. For more technical information on the subject see Kappy on Error -9972
There is a possibility that the condition can be brought about by a failing HDD, although that is not always, or even usually, the case. So the first order of business would be to run either TTP or DW and see what you come up with.
As to what you can do to recover your data if you are unable to mount the disk that can be a challenge. Here is what I suggest:
Download the demo version of DataRescue II
Boot computer in FW-TDM and see if DataRescue can locate your data.
If the files which you want to backup show up you will have to buy the license to be able to recover them. Dr. Somke's FAQ Data Recovery is a good tutorial on the subject.
Please do post back with further questions or comments.
cornelius

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