Mac OS Partition has disappeared

I have a macbook 2.. ghz with Mac OS 10.4... (sorry for the imprecision, I don't see the system anymore) The HD has 2 partitions, one for Mac OS one for BootCamp.
I was working on a Word file and got the message that the document could be save because the disk was full. I had to force quit word, and then the Finder froze and I had to force a shut down.
When I tried to start again, nothing happened, only a grey screen.
I've tried to start in safe mode, nothing
I've reset the PRAM, doesn't start
I was able to start it in TERMINAL mode and plug it to my other computer, but I can't see the HD even when I run disk utility, However I can see the CD that was in the drive.
I've started with the Mac OS install disk and run Disk Repair, I can see the HD, with two partitions, but one shows as 'UNTITLED' and the other is the bootcamp one, I can't run a check or a repair on the untitled partition.
I've tried to archive and reinstall the system, but the only disk I see for installation, is the Bootcamp
partition, the other partition doesn't show.
I would like to be able to access the Mac os partition to save my documents and then reinstall the OS, any suggestions how to achieve this
Thanks for your help

Tried to start from my good computer, I could see the good hardrive in terminal mode but the bad computer froze when I tried to select my good drive as a startup disk.
I've also tried to install a fresh system on the Window Partition after I've erased it, it starts ok but after 10 mn tell me there is an error in the installation.
I've also run Diskutility from the install CD and I can see both drive. but for the mac OS one, it show me it is a Mac OS format and its size bu tit is not able to show me how much free space is left.
I've tried a repair since this function was available, but after few minutes an error message told me that the repair cannot be performed.
This is a very puzzling problem, but I would really like to be able to save some of the file that are on this partition.

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