PowerBook G4 12" Hard Drive upgrade not detected

Hi,
The original 80GB drive in my 12" PowerBook just died. I had been planning to upgrade anyway so I went out and bought a 320GB WD Scorpio Blue PATA drive. I followed the instructions on iFixIt to change the drive and reassembled the PowerBook. I checked all connectors and I can hear the drive spin up when I turn on the laptop. However, the Leopard install DVD does not detect the new drive. It doesn't show in System Profiler or in Disk Utility. I have verified that the drive works by connecting it via a USB enclosure to my iMac. Am I missing something? Is the 320GB drive compatible with my PB?
Thanks

Given that the HD works fine in an external enclosure but isn't detected at all when mounted internally, I surmise that either (a) you failed to get its flex cable firmly reconnected to the logic board, or to the drive itself, when reassembling it, or (b) you damaged the flex cable itself. Press the connectors very firmly into place, especially the logic board connector, then test again. If that doesn't help, you may want to order a replacement cable and see whether that solves the problem.

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