New HDD wont show in System Profiler

My Hard Disk died.

So I've bought a Mach Xtreme Technology PATA 1.8" SSD to replace it.

(Part Number MXSSD1MNANOZ-120G)

Ive installed it as per the iFixitYourself tutorial

http://www.youtube.com/watch?v=PnV7mHS7Q...

I am doing a fresh install using my ligitimate Snow Leopard DVD on my USB disk.

The USB is installing but NOT finding a hard disk to install to.

When I use System Profiler is does not find the Disk under Hardware>ATA (or even Serial-ATA)

I've double checked the connections.

The genuine Mac SSDs are ridiculously expensive. The drive I've installed is the same form factor.

Is there something I have missed?