WD MyBook Pro 320 Mounts w/FW 800 on G5 but not on MacBook Pro

Hi, I just got a WD MyBook Pro 320 GB HD for backup purposes. I've seen other people with problems mounting a WD MyBook, and in my case there is a slight difference. It will mount with via FW 400 and 800 on my G5, but with my MacBook Pro it will only mount via FW 400 (and not 800). Before I send this thing back does anyone have any ideas what is wrong, and/or anyone have any similar experiences? BTW, this problem occurred both before and after I repaired Disk Permissions and checked and repaired the disk on the MacBook Pro (it did need repair according to Disk Utility), upon the suggestion of WD tech support, who said that the problem might be the MacBook. Both computers OS 10.4.9.

No, during the several times that I tried it (and just now I tried again), I didn't have anything plugged into the 400 port of the MacBook; I only had the WD plugged into the 800 port. And I know that the 800 cable is fine, because several times I tried the WD with my G5, using the 800 port with the same cable, and it mounted no problem.
I suppose I could just use it with the 400 cable on my MacBook, but I'm afraid that this problem may be a sign of other problems down the road, especially given my reading about other people having trouble with WD. I think I'm just going to send it back. Thanks everyone for your help.

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