My iMac (late 2006) no longer boots from FireWire drives, although they contain all the system files.

My iMac (late 2006) no longer starts (boots) from Firewire drives, although they all contain a current system (Mac OS X 10.6.7). If the drives are connected with USB 2, they boot normally. The FireWire drives appear in the Start Volume program, but they do not boot. If I press and hold the Alt key while booting, only the internal drives and the USB drives appear as options. What can I do in order to boot from FireWire drives as I always could in the past?

I'd first recommend doing a SMC reset and if that doesn't work refer to:
http://reviews.cnet.com/8301-13727_7-10333969-263.html
and
http://www.thexlab.com/faqs/firewiretroubleshooting.html
SMC RESET
Shut down the computer.
Unplug the computer's power cord and all peripherals.
Press and hold the power button for 5 seconds.
Release the power button.
Attach the computers power cable.
Press the power button to turn on the computer.
PRAM RESET
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
Roger

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    Below is LaCie's Tech Support Reply. What is interesting is that they suggest Carbon Copy Cloner (instead of Silverkeeper). Also interesting is that it worked. I hope this helps some of you.
    Ted
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    Ho Lee MACkeral wrote:
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    Hi, thanks for replying.
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