Snow Leopard Installer doesn't detect my hard drive?! help!

After my earlier post, where my replacement 320gig hard drive is incorrectly (not GUID) partitioned, I backed everything up, made a time machine copy just to be safe, and set about formatting the entire drive, doing a fresh install, and then updating via one of my back ups etc.
However, when I tried restarting from the CDRom, it just hung on the Apple grey splash screen for about 10 minutes with nothing happening, I restarted and held one 'ALT' the two options were my hard drive and the Snow Leopard install disk - I selected the install disk and after short while I was presented with the installer.
The installer displayed no hard drive, nor did the disk utility within' the installer, I can't think what the problem could be, as, as soon as I ejected the installer cd, I booted straight back into my normal system (which I am writing this on now).
I really am stumped as what to do next, comments, suggestions and observations welcome :-D
Andy (D-F3ens)

I tried that and the both disk's pass the verification, the problem is the installer detecting my hard drive.
When i'm running 10.5 and try to install from the SL Disk it picks up the hard drive (but says it cannot install to this volume, use disk utility etc) - its when I restart and enter the installer via the splash menu, it fails to pick up my hard drive.
I cant see any other way of partitioning my drive to the required GUID, even when I made a seperate 20gig partition, it remains as Mac OSX Journaled on the same drive thats partition scheme is 'Apple Partition Map'.
Bootcamp will not help me either, I thought of creating a seperate partition and installing it to that, then reformatting the rest of the drive from within' SL, but Bootcamp says that it cannot modify the 'startup disk' and says it requires reformatting.
I really am stumped as to what to do next, I can't understand why the installer picks up the hard drive whilst its running, but when its in the installer it doesn't
Help!!!!

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