Disk problems with my Macbook Pro

Hi there
Dont realy know where to post, but ill try here.
I have a 15' macbook pro, and the other day when i tried to start it, it just wouldnt load. It stopped during the "spinning gear". After having it at service for a test, they concluded it was nothing wrong with the hardware or software as they found. Anyway, I have now desided to erase the disk and start from scratch.
The problem is, I cant make a new partition because it cant unmount the disk.
I only have 1 partition from before, and thats where OSX and all is.
I cant repair the disk, because i cant unmount it.
I cant do anything with it basicly, because i cant unmount it.
And yes, i have started from the install Dvd. A dousin times. So i just cant see why it cant unmount it. Even starting from the CD.
Sorry for my crappy english
Id appretiate if someone know what i can do or try so i can make my mac work again.

Ok, after finding the right commands i succeded to force-ejekt the drive.
Now when i entered the disk utility (still from install dvd), I first tried to format the disk.
Then i got this message:
PISOX reports: The operation couldn't be completed. Cannot allocate memory
The same message comes if i try to partition the disk.
No idea what to do next... Any suggestions?
Message was edited by: Freddy1988

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