Disk Util wont read my .dmg backup

Hello,
Because I changed my hard drive, I thought it was wise to partition the new one with Disk Utility so it would have two partitions so I could just make a .dmg from the Mac OS parition and the Bootcamp partition over to the new ones.
While it worked for the Mac OS one, it didnt for the Bootcamp one and I couldnt boot Windows XP anymore.
When I asked the Bootcamp Assistant to setup my system it said it wasn't happy with my partitions and need a GUID disk.
Since mine was in AFM, I had to erase everything on it and put it in GUID with a single partition.
Now, before doing this I had Disk Utility erase the second partition I did on the new drive, make the Mac OS partition the whole disk and used Disk Utility to make a .dmg backup of the drive.
Since I formatted in GUID with a single partition, Disk Utility decided it doesn't like my .dmg backup anymore.
I reinstalled OS X Leopard from scratch and tried to mount it but it says no valid filesystem inside.
I tried to raw copy it with dd in terminal on a USB disk but same thing, it won't mount the drive.
When I use the restore function in Disk Utility, it says error 254 cannot validate filesystem.
I used it once successfully to check it before erasing the master drive and now the backup won't work anymore.
I am very upset, this 90 gigs backup contains all my photos, music and files.
Thanks for your help!
Pierre

I had a 320Gb drive with OS X on one partition and XP on another.
I bought a 500Gb drive, I thought I could do the same 2 partitions and just copy over the OS X and XP partitions to have everything work like before.
But it didnt work so now I have a .dmg containing my original OS X partition that I would like to copy over to the new HDD but it wont work as the dmg has not filesystem in it according to Disk Utility and gives an error 254 when I try to use it with the restore function.
However, I used this very same dmg file once yesterday to restore the drive. It was fine except that the new drive wasnt set to be a GUID drive so it would only boot so far but won't get into Leopard, hanging one line before launching the login app (I have the boot sequence set as verbose so I could see where it hung).
And now the same dmg file isn't working anymore on the GUID formatted 500Gb drive.

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