Can not connect an external hard disk

Hello,
For the second time , I have a problem while connecting a external hard disk. (the first issue was not solved).
Previously, I was triying to connect my external hard disk. But my powerbook 10.4.11 could not see it. I could heart my external disk "running". It was doing a small repeatitly noisy. But in the finder, it was not displayed.
Now I am triying with another one and I am experiencing the smae problem. Finder does not displayed it.
I guess the USB port does not display enough power. But I am not sure.
Do you have a idea how can I solve my proble in order to be able to see external hard disk and copy file in it?
Many thank for your help

I connected the external hard disk to a pc and checked the in disk management management tools. I activate the partition of the external hard disk, then I reconnected it to my Powerbook 10.4.11 and FInder can not see it...

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