Firmware update incomplete - now no video!

A friend brought me their flat panel iMac after a firmware update went wrong. They said the instructions were to hold down the power button until the bar appeared, which they said they did. But now iMac displays absolutely no video. I can hear the startup chime, I can hear the hard drive churning along like a champ, but absolutely no video! I tried rebooting the iMac with an original Leopard disk - nothing. I'm now in the process of reinstalling Leopard via target disk mode but something tells me that isn't going to solve the problem either! Because as strange as it seems there was video in target disk mode either. Just a black screen and the white light to tell me it's on.
My questions:
1) Is it possible to fix this firmware update?
2) Can the firmware be overwritten or undone?
3) Can any of this be done via target disk mode?
Any help would be greatly appreciated!

The little information that you are giving us is not much to go on. This is the Intel Apple Discussions forum. Usually Intel iMacs are not referred to as flat panel. The flat panel iMacs were G4 PowerPC iMacs. But if this is an Intel Mac, then there is a firmware restoration CD that can be downloaded from Apple Downloads, burned to disk and used to restore the firmware on an iMac with an interrupted or unsuccessful firmware update. The CD image can be downloaded and burned on a PPC or Intel Mac, but these can only be used on an Intel Mac to restore the firmware. The link is for Firmware Restoration CD version 1.6, but if the iMac you need to repair is not listed, use the links to go to version 1.4 or 1.3 to get the correct one for the model you need to repair.
http://www.apple.com/downloads/macosx/apple/firmware_hardware/firmwarerestoratio ncd16.html
Dah•veed

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