After Firmware update iMac won't start up

Hi I have this problem with my iMac G5
I try the explanation about downgrade to 10.4.9 But when I go to the Disk Utility and perform verify disk the answer is "
Verify and Repair Disk "Macintosh HD"
Checking HFS Plus Volume.
Checking Extents Overflow file.
Checking Catalog File.
Keys out of order (in bold red)
Rebuilding Catalog B-tree. (in bold green)
The volume Macintosh HD could not be repaired.
Error: the underlying task reported failure on exit
( in bold red)
1 HFS volume checked
1 volume could not be repaired because of an error. (in red)
Repair attempted on 1 volume
1 volume could not be repaired (in red)
Then comes a window saying that the first aid failed!
Now what can I do.
And if some could tell me how do I backup using firewire cables to another mac.
Thank's

First, the back up with firewire is Target Disk Mode. If the other computer can see yours, you should be able to drag your data over.
As far as your problem is concerned, did you try the repair from your install disc? If not, start up from your install disc holding down the C key, then go to Disk Utility and then Verify and repair hard drive.
Let us know how you make out,
Miriam
Miriam

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