IMac 21.5",3.2 ghz i3. has dead firewire 800 port.

Like it says firewire 800 port does not work. I plug in a known good ext HD. With known good cable. Power light on HD comes on & I can hear it spinning
but it never mounts to desktop. Doesn't show up in Disk utilities either. HD mounts fine if I use usb port. I know FW 800 port on HD & cable are both good
because they work fine on friends 27" iMac. Anybody have any ideas or suggestions. I would really appreciate it.
Thank you in advance
HAPPY HOLIDAYS

I have tryed that. I've also tryed resetting the SMC, & the PRAM. Thank you for the suggestion.
From what I've been reading on this site, it sounds like I don't have any choice but to bring the
iMac into the service center. I am glad I got Apple care. Otherwise I would be screwed. My iMac is just over 1 year old. Once again Thanx for your time & help. Appreciate it. Have a Great Day

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