Issue w/external drive that was once an internal main drive

I recently replaced the hard drive in my Powerbook G4 and planned to use the previous hard drive as an external drive, but I’m having difficulty with the drive being recognized. All the external case does is blink. Doesn't even whirl. I’ve used Disk Utility with no luck, but when I plug the drive into a Windows machine it does physically recognize the drive, it just can’t read it (likely due to having OS installed). Do I need to set the jumpers to slave on the old drive for it to be recognized on the Powerbook? Is there an issue with both the internal and external drives both having Mac OS installed?
Thanks in advance for the help!
-David

Assuming you put the drive into a bus-powered USB enclosure, the problem is that your Powerbook, like most or all PB G4s, doesn't put out enough power via the USB port to operate the drive fully. It will spin, but the heads won't move. There are four remedies:
1. Use a USB "Y" cable that enables the drive to draw power from two USB ports instead of just one. Here is one example.
2. Connect an AC adapter to the drive to power it, if it has a port for one.
3. Connect an AC-powered USB hub to the computer, and connect the drive to the hub.
4. Replace the USB enclosure with a FireWire enclosure and connect the drive to your FireWire port, which provides more power than the USB ports do.

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Issue w/external drive that was once an internal main drive

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