MacBook5.1 with 10.5.7 can't recongnize external HD

What can I do I've tried every thing, HELP!
-I format my HD to Mac OS Extended (Journaled)
-I download the last version of airport utility 7.4.1
-I restart a lot of time
- spend the entire day on the computer trying to solve this problem....
I am out of ideas
I have three MacBook, two exact same (aluminum 5.1) on 10.5.7
and a Black 4.1 on 10.5.7 as well
My HD only work on my Black 4.1 HELP!!!!!!!!!!!!!

Patguit wrote:
It has it's own power supply, and it's plug direct in the usb on the MacBook.
Taking power from the Mac can be "iffy." It's possible that there isn't quite enough power on this Mac's USB bus to power the drive.
If you have other USB devices attached, try again with them disconnected.
You might also try different ports.
Can you borrow a powered USB hub to try?
As drives age, they often require a bit more power. How old is yours?
You might want to check with the maker (support and/or forums) to see if there are any firmware updates for it.

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