Setting up a new HDD in a G5

Hello, I'm new to the mac world and really am hoping someone here can help me. My work was getting rid of a G5 powermac and I was able to get it so long as the HDD was removed (for information security reasons). I quickly fitted a new 80gb HDD and booted the system with the OS X 10.1 disk inside to re-install everything. However no matter what I try I just get the flashing question mark icon on the screen, I've tried holding C on bootup with no change and am a bit stuck now. I also tried the same thing with the OS 9.2 disk that was in the box, still no luck

Does anyone know what I'm doing wrong and how I should go about installing the OS? Any help would be greatly appreciated.

Are they the grey restore disks that originally came with that mac?

Are you pressing C immediately on power up and holding the C key down until booting starts

Have the people at work pulled the interface cable out from the optical drive by mistake?

I have a grey OS X developers tools disk, an OS X 10.1 disk and a OS 9.2 disk.

I've tried holding down the C button from startup and the DVD drive is connected up fine.

You cannot boot from a developer disc.

Likewise you cannot boot a G5 in to Mac OS 9

And finally the G5 ran 10.2 and above, so that might explain why the 10.1 disk will not work.

You will need a retail copy of OS 10.4 Tiger or 10.5 Leopard, unless your work has the grey restore DVD that came with the G5 when shipped

Humm, the Box's must have become mixed up as the G5 instruction books etc are in there. I will check it out on Monday, thanks.