Firewire doesn't work.

Hi,
My macbook pro firewire doesn't not work anymore.
I try all the way (reset the SMC and RAM also) but it stil can not work.
My HDD is Lacie, it's worked with iMac and used to worked with MP.
Any idea to help me fix this problem, please?
Thank you!

janieshin,
so I take it that your Lacie HDD is an external FireWire disk? You’ve noted that at some past time, it worked with an iMac — have you confirmed that it still works well when connected to other Macs with FireWire ports? Do you have a second FireWire device to test against your MacBook Pro, to ensure that the problem is not with the Lacie disk? Have you tried running your MacBook Pro’s Apple Hardware Test, to see if it can detect a problem with the MacBook Pro’s FireWire port?

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