Why does my macbook pro crash when I connect my external hard drive?

When I connect my external hard drive to my macbook pro (with fire wire) it crashes my computer... Any thoughts or help??

Thanks for the response. I tried both methods with the same end result.
I'm in safe mode now. It doesnt show up as being plugged in. It worked fine when connected with the USB-I went to disk utilities and repaired the disk.
I tried to plug in with the firewire, again and it shut down my computer..
Any other suggestions?

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