Firewire 800 port disfunction?

I've just recently started using a 27" IMac '11 for music recording and production and whenever I connect my interface, it doesn't sync properly (ground hiss in my monitors, latency issues, etc).  I usually would be posting this on a music forum but I've used the same equipment connections on a Macbook Pro '11 and everything works fine, so I'm guessing it's a mac related issue.
If anyone can help me it would me much appreciated.
Thanks

Try resetting the SMC
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.

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