External Hard Drive is not being recognized by Firewire 400

Hi everyone,
I update my Mac OS X (Leopard) last night, so this morning when I was going to connect my External Hard Drive (EDD) to my MacBook; the Firewire, which I normally used through Firewire 400, did not recognized my EDD. However, I tried by connecting using the USB option and it recognized the EDD working perfect. Thus, I would like to know how do I turn the Firewire 400 on/available, since it seems not being working properly.
Thanks a lot,
M
Macbook (Intel) early 2007.

if you have the power supply that comes with the external, use that if you haven't use it instead of rely on bus powered port.
connect your external, click blue apple on top left corner > about this mac > click more and on system profiler click firewire, and see if your external detected there.
You can try to reset PRAM to refresh your hardware behavior too:
http://docs.info.apple.com/article.html?artnum=2238
Good Luck.

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