My firewire connection to the hard drive is no longer recognized

My external hard drive with firewire cable connection to the imac has been working fine for months. Suddenly got error message that firewire devices were not being recognized by the computer. I tried poweriing dowm computer and external drive and resetting PRAM but no response. Any suggestions welcome

If you look at your >SystemProfiler (option key)>Hardware>Firewire.
If Firewire is being recognized ie
FireWire Bus:
  Maximum Speed:    Up to 800 Mb/sec
I would suspect the ext. HD or the cable.
Rebooting will reset the Firewire port.

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