PowerPC :: G4 Not Booting After Installing New Hard Drive

My newly acquired "ibook G4 1.33ghz 12 inch" is having problems booting just after recently insatlling a brand new WD Scorpio Blue 160GB hard-drive. I installed myself with the very useful [URL] tutorial which ran through the process quite simply. Basically the background story here is, I was given the ibook by a friend of mine who didn't want it as she didn't have the patience, money and time to invest into having it fixed. Some three years ago she dropped it from her coffee table and since then the hard-drive started failing, getting louder and slower to eventually one day not switching on at all. She took the ibook to an Apple Genius bar in LA where they ran diagnostics and resulted it with having a failed hard-drive.

She never had it repaired and has since been keeping it stored away as a spare. She was kind enough to gift it to me, I was well up for the challenge to repair it so here I am!! So, I bought a new hard-drive, successfully installed it and then the moment of truth, the ibook DID switch on, this itself was good news. But ever since I haven't been able to progress any further, as when I switch the ibook on it makes the apple start-up sound then goes to a white screen and says this:
Invalid memory access at SRR0: ff8486a4 SRR1: 00003030
Apple PowerBook6, 7 4.9.3f0 BootROM built on 07/05/05 at 11:14:11
Copyright etc.

Then says:
To continue booting, type "mac-boot" and press return
To shut down, type "shut-down" and press return
Reducing system power
So if I type "mac-boot" it goes to a grey screen with a folder icon in the middle containing a little 'finder' face and a flashing question mark, and then if left for about 5 minutes or so it just switches itself off. Of course it occurred to me that there is nothing on the new hard-drive so it can't boot from anything, I tried using my intel mac's start up disk which has OSX tiger on it, but this doesn't give any better results, I start-up holding C and I here the disk being read but it can't boot from it, it still goes back to the OpenFirmware screen as above.