Powerbook G4 leopard installation black screen solution?

I was given a Powerbook G4 without a hard drive or any ram installed. I purchased a new hard drive and ram, along with a OS X Leopard Retail disc. I have tried installing it multiple times, every single one resulting in a black screen with the coloured pinwheel. I was told by my network technician that the CD drive needed changing, so I purchased a replacement for that as well.

However, I am still getting the same result. When I switch it on and insert the disc, the powerbook chimes, shows a screen with the 'no OS' icons, changes to the loading Apple for about a minute, then to a completely blue screen for another minute or so, then finally to the black screen. Shortly after the black screen appears, the cursor also appears and then changes to the coloured pinwheel.

I can here the disc and the hard drive running, along with a clicking every now and again from the disc drive (is this normal?). I have left it for over 2 hours, and it still hasn't changed.

The powerbook meets/exceeds all of Leopard's minimum requirements and recognises the hard drive when booted in open firmware. Does anyone know how to solve this please?