IMac will not acknowledge my external hard drives anymore

both I have connected w/ Firewire 400, and it used to recognize them with no problem. Now it is not acknowledging them. Any tips?

I am having the same problem with acomdata 250G firewire only drive. It used to mount fine. I was able to boot from it and work from it. Now I get an error that the imac doesn't recognize the drive. If I click 'initialize', i get disk utility, which spins but does not do anything until i force quit.
The drive seems to remount on reboot, or the first time I plug it in after rebooting, but once I unmount it or turn it off, it will not remount.
The drive is a clone of my imac hard drive. I erased and partitioned it with disk utility before cloning with carbon copy cloner.
12" pb g4 1.33/768, 20" imac cd 2G/1G/256M   Mac OS X (10.4.4)  

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