Drive not SHowingup in Disk Utility, HW Test OK?!

Anyone have hint on where to look for solutions to this:
Starting up from the Tiger CD, Disk Utility window does not show the internal HD (either the new one or the old one).
However, running G4 iBook HW Test CD however shows that all is good, including "mass storage".
Puzzling to say the least.
Thaks for your ideas.
Tom

The new drive was bought new (Seagate 5400 60GB ATA6) to replace the original Toshiba 30GB that the computer would not start up from. DU, run from the CD, reported a SMART failure on that drive. Thus, the replacement. Along with a new ribbon cable.
The new drive is obviously unformatted. That's what I want to use DU for so I can install OS.
Funny, now even going back to the old drive, it too isn't found by DU!
It's as if there is no drive even connected.
Thanks in advance. I really don't want to discard an otherwise perfectly good G4 i Book.
Tom
iBook G4, MacBook Black, PowerMac G5   Mac OS X (10.4.6)  

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