Problem with internal HD upgrade- Flashing "?" over HD icon on startup

Last weekend, I installed a Western Digital 250GB internal IDE 2.5 inch drive (WD2500BEVE) to replace the internal HD on my 15 inch G4 PB Aluminium (not sure of processor speed, but purchased new in 2004, with OSX 10.4.11). I backed up my existing HD to my friend's MacBook, as a disk image using Carbon Copy Cloner. I was very careful with the installation (using anti-static wristband etc etc). The installation appeared to go well. The newly installed internal HD could be mounted as an external HD of my friend's MacBook (using firewire Target Disk mode). Carbon Copy Cloner copied everything back to the new internal HD without any apparent problems.
BUT THEN... when I disconnected the firewire connection and tried to start my computer on its own, the dreaded 'flashing question mark over hard drive' icon appeared.
Can anyone suggest what the problem might be? Three things I've already excluded are:
(1) The jumper settings on the HD are correct.
(2) I formatted the new HD as Mac OS extended (journaled)
(3) The problem is not with the master boot sector (i.e. the problem is not merely that the computer can see the HD but does not know how to load the system from it). My computer cannot see the HD at all -- when I insert my operating system DVDs as if to reinstall the system, my internal HD does not even appear.
I am not panicking as I can still view the contents of my internal HD by booting it as an external HD of my friend's computer. But there seems to be a problem with my CPU communicating with my internal HD. The core of the mystery is: why can I boot my new internal HD off my friend's computer using FireWire, yet when I start my computer on its own using the operating system DVDs, the computer doesn't seem to recognise the HD whatsoever?
Does anyone have any suggestions?

Can we establish what model Powerbook you have? Take the battery out and look for the label.
I have a feeling that your PB cannot recognize the 250GB drive, although I was under the impression that the older PBs that could only recognize 128GB would simply ignore the extra disk space. Perhaps the ATA specs aren't all backward compatible, although the Firewire interface can handle it.
Other World Computing can obtusely point out which drives your model can handle, although I don't know it its 100% accurate.
http://eshop.macsales.com/MyOWC/

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