Imac MC309 doesn't recognize lacie hd fw400

I have bought an IMAC MC309 and it doesn't recognize the external hd fw400.

no, it doesn't.
Also, pressing 'T' during startup, even without FW cable connected, monitor shows the FW  icon and another icon 'arrow'. So I don't know if there is a problem with FW port.
is there a way to check if FW port is ok?
thank you
Marco

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