Firewire stopped working on iMac G5

I have 2 firewire external drives on my iMac G5. Today, after a reboot, they stopped showing up. I moved them over to another mac and both came up just fine, so I'm sure the drives and external cases are good. I then connected one using USB (the other one doesn't have USB). It's working ok with USB. The problem is I need Firewire for other stuff (video camera and other camera hook up), plus I prefer to use firewire for the external drives.
When I go to System Profiler and click on Firewire, it shows "Firewire bus:" and that is it. Any ideas? This it a bad logic board? Is it possible that the firewire circutry got disabled? Can I fix it? Any suggestions would be appreciated.
Thanks!

Try one of these:
Zapp the P-RAM:
After the startup tone, hold down <commandd><option><p><r> until 3 additional startup tones are heard, then release the 4 keys.
Open Firmware reset:
After the startup tone, hold down <command><option><o><f> until the text screen is visible. When text can be entered, type the following commands, followed by the <return> key (there are no space characters in each command):
reset-nvram
set-defaults
reset-all (the Mac will boot up after this command is entered)

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I have updated 3 - G4 733mhz , 1 Mac Mini and 1 17" flat panel Imac with the newest 10.4.8 and security updates. The Firewire has stopped working in all of the above. Any help or suggestions?
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How do you know?
What I mean is, you say "the Firewire has stopped working", but you don't say how you came to that conclusion. Have you tried a variety of devices which are known to work on other machines?
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My Grin wrote:
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https://discussions.apple.com/message/25429854#25429854

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Hi all,
I have done a fair bit of googling and had a look at the discussion history here but couldn't find a solution to my problem. Apology if it has been raised and discussed before and I woud appreciate being re-directed to the thread.
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Hi,
At the OS X 10.8.2 update things regarding the iMessages Account's login were changed.
It now requires that the Mac's Serial Number is held in the Memory for it on the Logic Board.
It can get missed in Refurbishments and Repairs.
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Go to Application/Utilities and open Keychain Access.
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It is possible that it also refers to your Public IP address in some way, this would seem unlikely as most people's ISP issued IP address is from a DHCP server - you basically keep the same IP as you are "Always On" between the router and the ISP but it can change.
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com.apple.imservice.iMessage.plist contains the Info you have in the Preferences of Messages (Apple ID, Linked iPhone Numbers and any additional emails)
com.apple.imessage.bag.plist contains which server at iMessages you connect to.
I would try deleting (drag to Trash) the second of these and then restarting Messages.
If that does not work Quit Messages and delete the AuthToken for your Apple ID (if the AuthToken appeared to be allowing access above.)
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How do you know?
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Message was edited by: ReadHeaded

Hello RedHeaded:
Please click on the "Solved" button in the header of HenryG4's post, since that solved your problem.
Thanx

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