Fire wire 800 not working on IMAC

My Fire wire port on my IMAC 24 inch is not working now.  I have tried switching cables, etc.  This started when I had to have the hard drive replaced.  The drives do work if connected by USB or FW 400. 
John

Have you reset your SMC and PRAM?  If that doesn't get your FW800 port going, run the Apple Hardware Test to see if it spots any hardware problem.

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    Message was edited by: Big CB

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  • FireWire 400 & 800 Not working

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